The genes for zeste eyes and forked bristles are located on

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 and normal bristled female and a red eye, forked-bristled male. Assume no crossing over.  If the F₁ offspring were crossed to produce an F₂ generation, what phenotypes would be seen in the offspring? Select all answers that represent an F2 phenotype. Red eyed, normal bristled flies are listed as \"wild type\" in the answer choices.

wild type females

wild type males

forked-bristled females

forked-bristled males

zeste-eyed females

zeste-eyed males

forked-bristled, zeste-eyed females

forked-bristled, zeste eyed males

Solution

In this particular example of Drossophila melaogaster , A cross is made between a zeste-eyed and normal bristled female and a red eye, forked-bristled male-- so in the F1 generation we will see a)z⁺t/ zt⁺= Wild Female and half of them zt⁺/Y = Zeste males.

From this generation of heterozygous drossophilas we can get the F2 generation as

z⁺t/ zt⁺= Wild Female, zt⁺/ zt⁺= Zeste female, z⁺t/Y = Forked Male and zt⁺/Y = Zeste males. So finally from the chart we can say a, e, and h is correct.