Sex-Linked Inheritance Problem Set

Sex-Linked Inheritance Problem Set 2

Problem 3: A fly cross involving two X-linked traits

What offspring would you expect from a cross between the female Drosophila described in problem 1 (red eyes and a yellow body, homozygous recessive for the yellow body color allele and homozygous dominant for the eye color allele) and the male described in problem 2 (hemizygous for both the recessive (white) eye color allele and dominant (tan) body color allele?)

A reminder that 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).

A. Daughters would be yellow-bodied, red-eyed; the sons would be tan-bodied, white-eyed

B. Daughters would be tan-bodied, red-eyed; the sons would be yellow-bodied, white-eyed

C. Daughters would be tan-bodied, red-eyed; the sons would be yellow-bodied, red-eyed

D. Daughters would be yellow-bodied, white-eyed; the sons would be tan-bodied, white-eyed

E. Daughters would be yellow-bodied, red-eyed; the sons would be tan-bodied, red-eyed

The Biology Project
University of Arizona
Updated: July 15, 1999
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