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Worksheet 17 Meiosis and Mendel
Work together but each student must complete and turn in their own worksheet.
1.
Start with a diploid “parent” cell that has two chromosomes as pictured below.
2n=2 means
that this diploid cell has two same-sized, homologous chromosomes.
Fill in the circles
below. Just draw chromosomes, no spindles or nuclear envelope.
Label
“A” and “a”
representing alternate alleles of same gene on homologs in each cell.
Use a vertical
metaphase plate. Label each cell type as haploid (1n) or diploid (2n)= number of chromosomes,
and amount of DNA (__ x) compared to a 1x gamete
U1453615
Coleman Stettler
2.
There are two pairs of chromosomes in this diploid cell (2n=4). Label the genes and alleles
on homologs and sister chromatids.
A
is on the big chromosome and
B
is on the smaller
chromosome. The genotype is
AaBb.
Using a vertical metaphase plate, draw the
two
independent orientations of this
AaBb
cell in
Metaphase I of MEIOSIS.
OR
GAMETES: ________
________
________
________
On the lines above,
indicate the genes/alleles in the gametes (after cytokinesis II) that
would results from that alignment in the circles above (no crossover has occurred).
3.
Draw replicated chromosomes in a cell that is
2n=6
versus one that is
3n=6.
(hint: first solve for 1n=_____ and draw the chromosomes in the appropriate haploid
cells. Make non-homologs different sizes)
GENETICS SENARIO:
(this is long. If you run out of time in discussion please on
your own or with help in study hall. This will be easier after class 19)
The gene involved in the disease
Sickle Cell Anemia (SCA)
is on human chromosome
11.
Allele “
A
” is the normal form of the gene and codes for a part of the protein complex
called hemoglobin. Hemoglobin is required for your blood cells to carry oxygen. Allele
“a” is an abnormal form of the gene.
The hemoglobin protein made from the “
a
” allele is
defective. Red blood cells containing the defective protein are very fragile.
This disease
is recessive–meaning that you have to inherit two copies of the recessive allele in order
to be affected with the disease SCA.
The gene involved in the disease
Cystic Fibrosis (CF)
is on human
chromosome 7. Allele “
B
” is the normal form of the gene and codes for a channel
protein that allows chloride to pass through a cell.
Allele “
b
” is the abnormal form of the
gene.
The channel protein made from the “b” allele is defective and doesn’t insert into
the cell’s plasma membrane, resulting in an inability of chloride to cross the membrane.
CF is also recessive therefore only people with two defective copies of the gene
(“bb”)
are affected with the disease.
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Related Questions
Activity 9GENES SEGREGATION BY BEAN-O TYPE Materials:
Colored beans to represent the gene for a certain trait of garden pea. (60 pieces of the same size and shape; 30 pieces of which are of different colors from rest)
Procedures:
1. Place the 30 pieces beans (one color) to one container and the other 30 pieces to the other container. Assign which color of beans will represent dominant and recessive genes of a specific trait of garden pea
2. Label the paper container as First Parent P1, male and other P1 female
3. At random, segregate the beans on the Lab table. Assume fertilization occurs and First filial generations (F1) are formed
4. Categorize the formed First filial generations
5. Put all the beans in one container. Assume that all the first filial generations undergo self-fertilization
6. Pick up the beans by two from the container without looking at it and collect the second Filial generation (F2)
7. Categorize the formed Second filial generations into two (2) phenotype, and…
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Practice Pedigree Problem help. I am confused so please show. Label Phenotypes and genotypes as you go about the Pedigree (and whatever else might be required)! Thank you again for your help, these questions confuse me).
Hair or fur length in cats is controlled by a single, autosomal gene; the short hair-allele is dominant to the allele for long hair. Hair color is produced by a different gene which is located on the X chromosome. One allele for this sex-linked gene produces yellow, while an alternate allele produces black fur color; individuals which are heterozygous for these alleles are calico or tortiseshell in color.
a). If a long-haired, black male is mated with a calico female homozygous for short hair, what kind of kittens will be produced in the F1generation? Give both genotypes and phenotypes; express the genotypes both symbolically and in words.
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Select the true statements. (can be multiple).
Sperm and egg cells are diploid, meaning that they have two copies of the human genome.
Somatic cells are haploid, meaning that they have one copy of the human genome.
Stem cells are haploid, meaning that they have one copy of the human genome.
Somatic cells are diploid, meaning that they have two copies of the human genome.
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Give typed full explanation
You are studying three linked genes in snapdragons. The flower color locus is in the center. There are 13.8 cM between the flower color locus and the plant height locus. There are 14.5 cM between the flower color locus and the leaf type locus. The coefficient of coincidence is 0.8. Pure-breeding tall, red-flowered plants with fuzzy leaves were crossed to pure-breeding dwarf, blue-flowered plants with smooth leaves. The F1 were testcrossed. Calculate the proportion of the testcross progeny that are expected to be dwarf with red flowers. Round properly to 4 decimal digits.
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Neep help ASAP.
A red flowered plant was crossed with a blue flowered plant and produced all purple flowered plants. When the purple flowered plants were crossed with each other they produced 5 red plants, 5 blue plants, 20 deep purple plants, 20 light lilac plants, and 30 purple plants
How many genes are involved in the color production?
Assume that red color is caused by an A allele and blue color by a B allele and determine the likely genotype of the plants in the F2 generation.
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Problem: A homozygous tall, homozygous white flower plant crosses with a homozygous short, homozygous purple flower plant. We know that the purple and tall flowers are the dominant traits. Show your work.
1. What are the genotypes of the offspring? Why?
2. What are the genotypes of the offspring? Why?
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Subject: Genetic problems
6. how would you recognize a line of garden peas that had become genotypically pure for a given trait?
7. A cross of two pink-flowered plants produces offspring whose flowers are red, pink, or white. Defining your genetic symbols, give all the different kinds of genotypes involved, and the phenotypes they represent.
9. In snapdragons, red flowers (R) are incompletely dominant to white (r), the hybrid being pink; narrow leaves (N) are incompletely dominant to broad leaves (n), the hybrid being intermediate in width ("medium"). show the genotypes and phenotypes for the progeny of a cross between
a. red medium and pink medium plant
b. a pink medium and white narrow
c. two identical dihybrids
12. In guinea pigs, short is dominant to long. A short-haired guinea pig was mated to a long-haired one. What proportions of the offspring (F1) will be expected to be:
a. homozygous short-haired
b. homozygous long -haired
c. heterozygous short-haired
d. heterozygous…
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Question:-
For a simple cross between a purple-flowered plant and a white-flowered plant, where purple is dominant over white.
a. Show the F2 in a Punnett square. What are the proportions of genotypes and phenotypes? Express as fractions, decimal fractions and ratios.
b. Now imagine that half of the pollen carrying the recessive allele die before reaching their target, while those carrying the dominant allele are unaffected; what are the proportions of genotypes and phenotypes now?What does this tell you about Mendel’s principle of segregation?
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Based on MS- LS3-1
Can you make a model that shows how blue eyes originated? Can you include genes, chromosomes, traits, proteins, and organisms?
Can you Include a Punnett Square to show how this trait could be passed on to the next generation?
Note: can you include the drawing as question is suggested? can it be simpler for grade 8 level
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select whcih ic correct When 2 wildtype alleles are on the same parental chromosome, this is known as [Combined or Coupling or dispersed or heterozygous or Repulsion] . In sharp contrast [Combined or Coupling or dispersed or heterozygous or Repulsion] is when 1 wildtype allele and 1 mutant allele are on the same parental chromosome
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Question:-
You are setting up a Mendelian tetra-hybrid (4 gene) cross. What are possible genotypes for the parents?
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Complete the problem below and upload your work here. Partial credit will be considered.
In corn, purple kernels (P) are dominant over yellow kernels (p) and round kernels (R) are dominant to wrinkled kernels (r).
In a cross of PpRr (purple, round) with a pprr (yellow, wrinkled) plant, the following progeny were observed:
Phenotype
Observed
Expected
(O-E)
(O-E)2/E
Purple, Round
117
Yellow, Round
126
Purple, Wrinkled
130
Yellow, Wrinkled
127
Total=500
Fill out the expected values in the chart above and calculate the Chi-Square value for your table, look up the p value associated with the Chi-Square.
How many degrees of freedom do you have in this cross?
2. What is your Chi Square value?
3. What is the p value for this cross and what does your value mean? Make sure to explain the p value clearly in a couple of sentences.
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TOPIC: GENE INTERACTION AND EPISTASIS
In pineapples, leaves may be spiny, spiny-tipped or piping. Pineapples of different phenotypes were used in the following crosses:
P1 phenotype piping X spiny
P1 genotype ______ ______
F1 phenotype 100% piping
F1 genotype ______
Crossing the F1s produced:
F2 phenotypes F2 genotypes
95 piping _______
25 spiny tipped _______
8 spiny _______
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Sample problems related to non Mendelian inheritanceRead, analyze and answer completely the following problems:
1. Explain why it is possible for the proband in the following pedigree to have children of blood types A, B, and AB. Considering epistatic genes, what are the possible genotypes of II-2?
2. Agouti (A) is wild type and produces alternating bands of pigment on each hair. Black (a) is recessive to agouti. A mutation on gene B (recessive b) can eliminate all color. In a cross between agouti (AABB) and albino (aabb) mice, what genotypes, phenotypes, and proportions are expected in the offspring in F1 and F2 generations?
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Problem: A homozygous tall, homozygous white flower plant crosses with a homozygous short, homozygous purple flower plant. We know that the purple and tall flowers are the dominant traits. Show your work.
What are the phenotypes of the offspring?
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Hi! I would love to get some help on the box-and arrow model question! :)
A male individual who is XYSRY has the following genotype for the AMH gene on chromosome 19: AMH1 AMH2. The AMH1 allele codes for a protein that is capable of binding to the receptor for AMH. The AMH2 allele codes for a protein that is unable to bind with the receptor for AMH.
Based on your understanding of biology, what is the likely phenotype of this individual?
Humans have 23 pairs of chromosomes of which 22 pairs are autosomal and the 23rd pair is sex-linked.In a human female, the sex chromosome pair is represented as XX, whereas, in a human male, it is represented as XY.AMH is an anti-Mullerin hormone produced by the Sertoli cells in males and helps in the development of the sex organs. Each pair of chromosomes has a pair of genes called alleles at the same loci representing a single character. Each gene of an allele represents the expression of the character.A gene can either show expression or…
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MAKE CONNECTIONS The ABO blood type locus hasbeen mapped on chromosome 9. A father who has typeAB blood and a mother who has type O blood have achild with trisomy 9 and type A blood. Using this information, can you tell in which parent the nondisjunctionoccurred? Explain your answer. (See Figures 14.11and 15.13.)
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mapping gene
The genes for ruby eyes (rb), tan body (t) and cut wings (ct) are all found on the X-chromosome of Drosophila melanogaster. All of these are recessive traits. They map in the order rb, ct, t with 12.5 map units between rb and ct and 7.5 map units between ct and t. Suppose you cross a cut wing male with a homozygous female that is both tan and has ruby eyes.
What will the F1 females look like?
Draw map of the section of the X chromosomes that has these 3 genes for the F1 females
Assume you testcross your F1 females.
What progeny classes would you expect? ii. Give approximate numbers for each class based on a total of 2000 progeny.
Assuming the i=1 and there are no double crossovers.
Assuming the i=0 and there are the expected number of double crossovers.
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Ch. 13-1
Mendel crossed a true-breeding pea plant with green pods and a true-breeding pea plant with yellow pods. All the F1 plants had green pods. Which color is recessive?
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polygenic trait mating 2
An AaBBCcdd male mates with an AaBbCCDD female.
1. What is the maximum number of ridge-producing genes possible in one of the children?
2. What would be the TRC for this child if it is a male?
3. What is the minimum number of ridge-producing genes possible in a child of this couple?
4. If this child were a female, would she have a higher or lower TRC than the parent with the lower ridge count?
A. lower
B. higher
C. equal
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Need help with the diagram
The STR DNA marker DS11 is located on the p arm of the chromosome #8 in humans. Molecular analysis has shown that Charlie Chaplin is a heterozygote for the STR marker (genotype DS11A and DS11B)
Using this knowledge, provide a diagram of meiosis showing only the movements of chromosome 8 (assume no nondisjunction). Throughout, indicate where the marker may be found (in other words, label the chromosome to show where the STR markers can be found. please only show the chromosomes at interphase, metaphase 1, end of meiosis 1, metaphase 2, and end of meiosis 2.
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Need help.
Knowing that the Curly leaf (Cy) is a dominant gene on chromosome 6, as it is useful in tracking other genes using trisomics for chromosome 6. Assume a Cy Cy cy plant used as a pollen parent where disomic pollen does not function crossed to a Cy cy cy female where disomic eggs do function.
A) What ratio would be predicted in the progeny of this cross?
B) What if the reciprocal cross was made?
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Task: Show your work/explain your reasoning as much as possible.
Grading Criteria: I want the correct answer and I want to see your work or read an explanation of your reasoning.
Question:
If a certain species has a DNA content of 5 picograms in each diploid cell's nucleus when the cell in in G1 of the cell cycle, what would be the expected DNA content (in picograms) of a diploid cell (from the same species) in mitotic prophase? Explain your reasoning. Consider ploidy changes and/or chromosome form changes, if applicable, when explaining your reasoning.
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Gene mapping using the Three-point Testcross
a) Given the following alleles that control seed traits:W = wrinkled G = green R = roundw = smooth g = yellow r = oval
b) Results of a cross with a triple heterozygote revealed the following phenotypes:30 smooth yellow round4 smooth green round958 wrinkled green round2 wrinkled yellow oval18 wrinkled yellow round946 smooth yellow oval16 smooth green oval26 wrinkled green oval
c) Determine the order of the genes and the distance between them in centiMorgan (cM).Construct a gene map to show your results.
TIP: Based on the phenotypes, determine the alleles in the gametes
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Topic: Penetrance.
Petal number is controlled by a single gene in merigonias. The gene has a completely dominant wild type allele F that makes a plant have five petals and a mutant recessive six petal allele(f). However the six petal trait is only 50% penetrant. You do the cross Ff x Ff. What fraction of the progeny do you have the 6 petals? what is the meaning for 50% penetrant.
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Think about the same two genes that were mentioned in Question 23—R and T, present in the heterozygous condition as R and r, T and t. Now imagine that the gene for flower color (the alleles R and r) is not on the same chromosome as the gene for plant height (the alleles T and t). Because the two genes are on separate chromosomes, they show independent assortment. What does that mean? When this nucleus undergoes meiosis, it can make gametes with four different genotypes. Why? A very important aspect is that the four different genotypes will be formed in almost exactly equal numbers. Why?
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Normal healthy humans have (check ALL that apply):
Group of answer choices
about 24,500 different gene addresses
1 or 2 alleles at each address (depending on whether they're homozygous or heterozygous)
23 pairs of chromosomes in each somatic cell
a system in which some genes are dominant over others
a system in which dominant genes are always the best ones to have
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Problem Solving:
In Drosophila, the gene that controls red eye color (dominant) versus white eye color is on the X chromosomes. What are the expected phenotypic results if a heterozygous female is crossed with a white-eyed male?
In cats, S = short hair; s = long hair; XC = black coat; Xc = yellow coat; XCXc = tortoiseshell (calico) coat. If a long-haired yellow male is crossed with a tortoiseshell female homozygous for short hair, what are the expected phenotypic results?
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QUESTION:-
In Drosophila, assume that the gene for scute bristles (s) is located at map position 0.0 and that the gene for ruby eyes (r) is at position 25.0. Both genes are located on the X chromosome and are recessive to their wild-type alleles. A cross is made between scute-bristled females and ruby-eyed males. Phenotypically wild-type F1 females were then mated to homozygous double mutant males, and 1000 offspring were produced. Give the phenotypes and frequencies expected..
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Topic: Trihybrid Cross,
Height in merigonias is determined by three unlinked genes that act additively. Each has two alleles, one compltely dominant allele(A,B or C) that makes plants taller and one recessive allele that makes plants shorter. Do the corss AaBbCc X AaBbCc. The fraction of The F1 progenty will be ? Pls explain it with more details. thanks
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Please show your work !!!!
Genes R and G are linked. They are arranged on the chromosome like this: Rg and rG. The frequency of recombination is 4%. Which gametes do you get from meiosis, and what fraction of each?
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DRAW OUT CLEARLY each of these chromosomes labeling as appropriate (demoed in class) The cell has a diploid number of 8 Each pair has a set of linked genes that are located on each end of the chromosome (paternal on left, maternal on right) Pair 1 AB and ab
Pair 2 DE and de
Pair 3 Fg and fG
Pair 4 hI and Hi Show what the chromosomes would look like in G1, G2, TI and TII
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Select true or false for each of the following statements regarding metaphase I.
Homologous chromosomes are connected only at the centromeres. Answertruefalse
Homologous chromosomes are aligned at the metaphase plate. Answertruefalse
The paternal chromosomes are aligned on one side of the metaphase plate and the maternal chromosomes are aligned at the other. Answertruefalse
In a cell with 4 chromosome pairs, there are 16 different ways to align the tetrads. Answertruefalse
Homologous chromosomes are independently assorted. Answertruefalse
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A. HUMAN PEDIGREE CASE ANALYSIS1. One couple has three children with the following sexes and ages: one son (40 y.o.) and two daughters (35 y.o. and 33 y.o.), all of them have normal pigmentation. Another couple has a son (35 y.o) and a daughter (20 y.o.) and all of them also have normal pigmentation. Both couples have normal pigmentation. The younger daughter from the first couple married the son of the second couple and they had three children. Their eldest daughter (5 y.o.) has normal pigmentation while their only son (3 y.o.) and one daughter (1 y.o.) have albinism.
a. Draw the pedigree of this family. Follow protocols in making a pedigree. Provide the genotype of all individuals in the pedigree. Please provide also the gene notation.
b. What is the mode of inheritance of this trait?
c. Justify your answer in letter (b).d. For their normal daughter, what is the probability that she is a carrier? Show solution.
e. If they will have a fourth child, what is the probability that the…
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- select whcih ic correct When 2 wildtype alleles are on the same parental chromosome, this is known as [Combined or Coupling or dispersed or heterozygous or Repulsion] . In sharp contrast [Combined or Coupling or dispersed or heterozygous or Repulsion] is when 1 wildtype allele and 1 mutant allele are on the same parental chromosomearrow_forwardQuestion:- You are setting up a Mendelian tetra-hybrid (4 gene) cross. What are possible genotypes for the parents?arrow_forwardComplete the problem below and upload your work here. Partial credit will be considered. In corn, purple kernels (P) are dominant over yellow kernels (p) and round kernels (R) are dominant to wrinkled kernels (r). In a cross of PpRr (purple, round) with a pprr (yellow, wrinkled) plant, the following progeny were observed: Phenotype Observed Expected (O-E) (O-E)2/E Purple, Round 117 Yellow, Round 126 Purple, Wrinkled 130 Yellow, Wrinkled 127 Total=500 Fill out the expected values in the chart above and calculate the Chi-Square value for your table, look up the p value associated with the Chi-Square. How many degrees of freedom do you have in this cross? 2. What is your Chi Square value? 3. What is the p value for this cross and what does your value mean? Make sure to explain the p value clearly in a couple of sentences.arrow_forward
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