The sex chromosomes in birds are Z and W. You have two true-breeding lines of canaries, one with yellow feathers and the other with brown feathers. In crosses between these two strains, yellow female brown male gives only brown sons and daughters, while brown female yellow male gives only brown sons and yellow daughters. a. How is feather color inherited in canaries? (2 points) b. Write the genotypes of the brown male and yellow female above ( 2 points) c. The brown-feathered F1 offspring from the cross between a true-breeding yellow female and true- breeding brown male were obtained. Write the genotypes of the F1 male and female, and write out the Punnett square of the cross between these two F1 birds. ( 4 points) d. What would be the probability of obtaining a yellow canary from the cross you drew in part c ? (2 points).

1. The sex chromosomes in birds are Z and W. You have two true-breeding lines of canaries, one
with yellow feathers and the other with brown feathers. In crosses between these two strains,
yellow female brown male gives only brown sons and daughters, while brown female yellow male
gives only brown sons and yellow daughters. a. How is feather color inherited in canaries? (2
points) b. Write the genotypes of the brown male and yellow female above ( 2 points) c. The
brown-feathered F1 offspring from the cross between a true-breeding yellow female and true-
breeding brown male were obtained. Write the genotypes of the F1 male and female, and write out
the Punnett square of the cross between these two F1 birds. ( 4 points) d. What would be the
probability of obtaining a yellow canary from the cross you drew in part c ? (2 points)