Suppose you discovered a new mutation in Drosophila melanogaster and called it b

Question

Suppose you discovered a new mutation in Drosophila melanogaster and called it black-eyed and were able to culture a population of true-breeding black-eyed flies. To test the inheritance of black eyes, you mated black- eyed males with wild-type females, and obtained the offspring in the table below: 6. Offspring Counts Observed Wild-type females 0 Brown-eyed Black-eyed Wild-type Brown-eyedBlack-eyed males 52 females 40 females 0 males 0 males 0 a) How is the black-eyed trait inherited? b) Using Drosophila notation, show the offspring genotype for each gender: Male: Female:

Explanation / Answer

From the data given, we see than only brown type females are there and Wild -type males. Hence This is a case of Incomplete Dominance and it is X - linked Inheritance.

Use the following Punnet square to prove it.

Thus XwXb are the brown eyed females and XwY are the wild-type males.

Genotypes of offsprings:

Males : XwY

Females : XwXb

Xw Xw Xb XwXb XwXb Y XwY XwY

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