2. In tomatoes, 2 pairs of genes affect the phenotypes of ripe fruit with the following alleles. R= red flesh r= yellow flesh O = orange skin o = yellow skin Dominance is complete for red flesh and orange skin. If the genes are independently following crosses. segregating, calculate the expected phenotypic ratios from the a. Rroo x rro b. Rroo x rr0o c. Rroo x Rroo
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- Name: 2. Some ladybugs have 10 black spots on their shells and some have 4. When true breeding 10 spot individuals are crossed with true breeding 4 spot individuals, the offspring have 7 spots. a. Propose two distinct explanations for this finding. Explain the nature of spot inheritance in each case. D. rew bacteria erred them figure above would of14N7 then ely 2 moldon omrod abitqaq ratlsmmem sge of delw toiisoibom s s neu not oomod aid to soubnup ogusl onomod odi to slevel ismon oouborg o o consu ud od souboini bluow uoy dairlw yd za00oq sdi mialex b. Propose an experiment that would distinguish between these possibilities. sor proieins9. In con, normal kernel are dominant to waxy kernels. If you crossed a waxy kernel plant to a heterozygous normal plant what type of seeds would be produced? Normal kernels (N), waxy kernel (n) Genotype: Nn, nn Phenotype: Normal kernels and waxy kernels Genotypic Ratio: 1:1 Phenotypic Ratio: 1:11. Use the following information to answer the question: Parental cross is RrYy x RrYy Seed Shapes are R-round, r-wrinkled Seed colors are Y-yellow, y-green Based on the information given, what is the phenotype ratio of the offspring of this cross? 2. A pea plant heterozygous for height and seed color (TtYy) is crossed with a pea plant heterozygous for height but homozygous recessive for seed color (Ttyy). If 80 offspring are produced, how many are expected to be tall and have yellow seeds? 3. What is the chromosome theory of inheritance? How does this theory explain Mendel's results? 4. A cross between two organisms heterozygous for two different genes (AaBb) results in a 9:3:3:1 phenotype ratio among the offspring. Is the offspring's genotype ratio the same? Explain your answer.…
- 3. For the following crosses, describe the genotype and phenotype frequencies of the offspring. I recommend using Punnett squares for each. Offspring phenotypes and frequencies А - 50% О -50% Parental Offspring genotypes and frequencies Parental genotypes phenotypes LAj x i Ai – 50% ii – 50% A and O Bị x Ai BIB x Ai AA x IBIB Bị x Bi AB x i4 *The normal color of snapdragons is red. Some pure lines showing variation in flower color have been found. Analyze the following crosses and do the following:² c. Explain the inheritance of these colors (include number of genes, alleles and dominance relationships). d. Determine the genotypes of the parents and the F1 of each cross. e. Propose a biochemical pathway for flower color production in snapdragons. F₂ Parents 1. orange x yellow 2. red x orange 3. red x yellow 4. red x white F₁ orange red red red red 5. yellow x white 9 red: 3 yellow: 4 white 6. orange x white 9 red: 3 orange: 4 white 7. red x white 9 red: 3 yellow: 4 white Hint: Come up with a possible pathway first, it helps to organize your thoughts. red 3 orange: 1 yellow 3 red: 1 orange 3 red: 1 yellow 3 red: 1 white redIII. Dihybrid crosses Two loci with two autosomal recessive traits Gene symbols a apterous wing size A normal wing size s sepia eye color S red eye color Be careful, S and s look alike when hand written The parents were apterous, red eyed color female and normal wing size, sepia eyed coloredmale (figure out the genotypes) Diagram of P1 cross: You are crossing AaSs with AaSs. Diagram of F1 cross: Give expected F2 phenotypic ratio: Give expected F2 genotypic ratio: IV. Other dihybrid cross Gene symbols v vestigial wing size V normal wing size s sepia eye color S red eye color The parents were vestigial, red eyed color female and normal wing size, sepia eyed color male…
- 3. What is the genotypic ratio of the testcross shown in Figure 4? 4. Give the phenotypic and genotypic ratio of the following testcrosses of dihybrids: Cross A Cross B P ΥY RR yy rr P YY Rr yy rr F1 F, YR Yy Rr YR Үy Rr (Y Yy rr Cross C Cross D P. Yy RR yy rr P Yy Rr yy rr F, F, (yr Y R Yy Rr Y R Yy Rr y R yy Rr Yy rr (y R yy Rr yy rr8. Kernel color in wheat is controlled by 2 pairs of genes (AABB). Determine the color of the offspring with the following genotypes: (Note: 4 contributing alleles – red; 3 contributing alleles – medium red; 2 contributing alleles – intermediate red; 1 contributing allele – red; and 0 – white AAbb x AaBb AABb x Aabb aaBb x Aabb AABb x aabb AABb x AaBb A wheat plant producing medium red seed is crossed with another plant producing intermediate red seed (refer to problem no. 8). How many individuals will be? Red Medium red Intermediate red Light red White5. A tall plant of unknown genotype is test-crossed (meaning it is crossed with a recessive tt plant). Of the offspring, 869 are dwarf and 912 are tall. What is the genotype of the unknown parent, TT or Tt? Complete the punnett square. Parent Genotypes:
- 4:12 5. Set up the punnett square for each of the crosses listed below. The characteristic being studied is seed texture round seeds (dominant) and wrinkled seeds (recessive). Rr x rr Rr x Rr RR x Rr Tall: % Complete the punnett squares below using the given information. 6. A TT (tall) plant is crossed with a tt (short plant). Which trait is dominant? Give the expected probabilities for each genotype and phenotype. TT: Tt: Short: Previous % % tt: What percentage of the offspring would you expect be round? Wrinkled? ZOOM + What percentage of the offspring would you expect be round?_____ Wrinkled? What percentage of the offspring would you expect be round? Wrinkled? % 7. A hybrid tall (Tt) plant is crossed with a hybrid (Tt) plant. Give the expected probabilities for each genotype. phenotype. wvm.instructure.com1. You are given a female F1 of unknown genotype. You cross the female fly to a homozygous male that has forked bristles and malformed eyes. The offspring of the cross is shown below: (Define symbols for your traits) Phenotype Forked bristles, normal eyes 752 Number Genotype Forked bristles, malformed 56 eyes Malformed eyes, normal bristles Normal eyes, normal bristles 820 64 a. What are the genotypes of the offspring? b. Based on the progeny, what were the genotypes of the F1 parents? What is the distance between for and mal?4. A male rabbit with genotype GgBb x with a female rabbit with genotype ggbb. ● The female only has one possible combination (gb) and her gametes are completed on the Punnett square below. To set up the Punnett square, use the "foil" method to determine the alleles present in the gametes. The image shown below will help you set up the male rabbit's genotype at the top of the square. ● Show the Punnett square and the expected offspring and their proportions. gb gb G g Bb gb gb How many out of 16 are: Grey, black eyed Grey, red eyed White, black eyed White, red eyed