The alleles for eye color and for body color are on the X chromosome of Drosophi
ID: 273582 • Letter: T
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).
(a) What is the genotype of a tan-bodied, white-eyed female who is heterozygous for body color? Indicate your choice from the table below. A. B. C. D. E.
A.
B.
C.
D.
E.
(b) Assuming that the two genes are VERY close to each other and there is no recombination, what offspring would you expect from a cross between the female Drosophila described above and a male who is both red eye color and yellow body color?
Indicate yes or no for each possible class of progeny; for example: class #1: YES Daughters would be yellow-bodied, red-eyed Daughters would be tan-bodied, red-eyed Daughters would be yellow-bodied, red-eyed Daughters would be yellow-bodied, white-eyed Sons would be yellow-bodied, red-eyed Sons would be tan-bodied, red-eyed Sons would be yellow-bodied, white-eyed Sons would be tan-bodied, white-eyed
A.
B.
C.
D.
E.
Explanation / Answer
Xwy+Xwy is the genotype of a tan-bodied, white-eyed female who is heterozygous for body color
Parents Xwy+Xwy X Xw+y Y
Gametes Xwy+ Xwy Xw+y Y
Offspring Xwy+Xw+y Xwy+Y XwyXw+y XwyY
Red Tan white Tan Red Yellow white Yellow
25% daughters would be Red eye colour with Tan body colour
25% daughters would be Red eye colour with yellow body colour
25% Sons would be white eye colour with Tan body colour
25% Sons would be white eye colour with Yellow body colour
YES Daughters would be Tan-bodied, red-eyed
YES Daughters would be yellow-bodied, red-eyed
No Daughters would be yellow-bodied, white-eyed
No Sons would be yellow-bodied, red-eyed
No Sons would be tan-bodied, red-eyed
YES Sons would be yellow-bodied, white-eyed
YES Sons would be tan-bodied, white-eyed
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