\"The sex chromosomes in birds are designated Z and W, and the male is the homom
ID: 89115 • Letter: #
Question
"The sex chromosomes in birds are designated Z and W, and the male is the homomorphic sex (ZZ) and the female heteromorphic (ZW"; Stevens. 1997).
Grant finds out that dilute homing pigeons sell for even more than slate pigeons. Dilute pigeons are “true” silver. Dilute is a sex-linked recessive trait (z-linked, represented by q). Grant decides to mate his smartest bird, Keith who is not silver (or a carrier), with his silver bird, Meredith.
What percentage of Keith and Meredith Grey's male chicks would you predict to be carriers of the silver allele?
a. 0% b. 25% c. 50% d. 100% Male Z Z Sperm Possible Offspring Eggs FemaleExplanation / Answer
Z and W are the designated sex chromosomes in birds. The make is the homomorphic sex (ZZ) and the female is the heteromorphic (ZW). The Z chromosome is a larger chromosome in avian species. The W chromosome is a smaller chromosome and contains a high proportion of repeat sequence DNA. The weight of evidence suggests that sex determination in birds is by a mechanism of genic balance.
So the answer is (C).
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