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- 1. In a cross between a black and a white guinea pig, all members of the F1 generation are black. The F2 generation is made up of approximately 3/4 black and 1/4 white guinea pigs. (a) Diagram this cross, showing the genotypes and phenotypes. (b) What will the offspring be like if two F2 white guinea pigs are mated?When pure breeding red dragons with large wings are mated with pure breeding green dragons with small wings (for simplicity one gene for each phenotype). All the F1 progeny are red dragons with large wings. What are the resulting phenotypes of a cross between the F1 dragons and the pure breeding green dragons with small wings?3)Mendel found that crossing wrinkle-seeded (rr) plants with homozygous round-seeded(RR) plants produced only round-seeded plants. What genotype ratio and phenotyperatio can be expected from a cross between a wrinkle-seeded plant and a heterozygousplant for this characteristic?
- 1. A man and both his parents are affected with a disease. His older sister is unaffected. This man marries a woman who is also affected with this disease. Her father is affected, but her mother and younger brother are unaffected. Assume that this disease is caused by a single gene with two alleles with complete dominance. Draw the pedigree of the family above using the correct symbols and numbering. (3) What is the chance that the couple will produce an unaffected child? Please show your calculationsCould an individual with blood type O (genotype ii) be a legitimate child of parents in which one parent had blood type A and the other parent had blood type B?A true-breeding rabbit with agouti (mottled, grayish brown) fur crossed with a true-breeding rabbit with chinchilla (silver) fur produces all agouti offspring. A true-breeding chinchilla rabbit crossed with a true-breeding Himalayan rabbit (white fur with pigmented nose, ears, tail, and legs) produces all chinchilla offspring. A true-breeding Himalayan rabbit crossed with a true-breeding albino rabbit produces all Himalayan offspring. Explain the inheritance of the fur colors.
- In Section 12.3, ''Laws of Inheritance," an example of epistasis was given for the summer squash. Cross white WAvYy heterozygotes to prove the phenotypic ratio of 12 white:3 yellow:l green that was given in the text.In cats, the genotype AA produces tabby fur color; Aa is also a tabby, and aa is black. Another gene at a different locus is epistatic to the gene for fur color. When present in its dominant W form (WW or Ww), this gene blocks the formation of fur color and all the offspring are white; ww individuals develop normal fur color. What fur colors, and in what proportions, would you expect from the cross AaWw Aa Ww?3) When a rabbit breeder crossed an agouti with a Himalayan, the litter contained equal numbers of agouti and Himalayan offspring. She picked one of the agouti and one of the Himalayan offspring and mated them, and was surprised when the litter also contained an albino. Explain these observations using genetic diagrams.
- Black eyes in mice are a dominant trait. Red eyes are due to recessive trait. What is the genotype and phenotype of the F1 generation if you cross a homozygous dominant male with a heterozygous female?A female hamster from a true-breeding big-eared strain was crossed to a male hamster from a true-breeding short-whiskered strain. Their offspring(F1) had normal ear size and whisker legnth. 1. One of the F1 males was crossed to a true-breeding big-eared, short-whiskered female. the following progeny were obtained. Are the loci regulating ear size and whisker lenght linked, and if so, what is the map distance between them? Normal ear, normal-whiskers 6 Big-eared, normal-whiskers 22 normal eared, short-whiskers 17 big-eared, shor-whiskers 5 2. Assume that the genes controlling ear size and whisker length are linked and have a map distance of 40cM. What would be the frequency of normal ear, short-whiskered hamsters among the progeny from a testcross of an F1 female? a. 0.4 b. 0.2 c. 0.3 d. 0.5 e. 0.143. Two pea plants are crossed. Each is heterozygous for height (T=tall, t= dwarf) and purple flowers (P = purple flowers, p=white flowers). What percentage of the offspring will be dwarf and white? phenotypic ratio Was it necessary to complete a Punnett square to answer this question? Explain.