The Genes for Zeste Eyes and Forked Bristles Are Located

question 14

Essay

The genes for zeste eyes and forked bristles are located on the X chromosome in Drosophila melanogaster. Both genes are recessive. A cross is made between a zeste-eyed female and a forked-bristled male.
a) If 200 offspring from this cross were obtained, present the expected number, sex, genotype, and phenotype in each class of the F₁.
b) If the F₁ offspring were crossed to produce 800 flies of an F₂ generation, present the expected number, sex, and phenotype in each class. Assume no crossing over.

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