Sex-Linked Inheritance Problem Set 2

Problem 2: Predicting the genotype of a male fly

Tutorial to help answer the question

The alleles for eye color and for body color are on the X chromosome of Drosophila, but not on the Y. Red eye color (w+) is dominant to white eye color (w), and tan body color (y+ ) is dominant to yellow body color (y).

What is the genotype of a tan-bodied, white-eyed male?


Phenotype and genotype of male

The male is hemizygous for both the recessive (white) eye color allele and dominant (tan) body color allele.

His genotype is Xwy+ Y.

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Updated: July 15, 1999
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