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BiologyBiology
17 September, 07:51

Eyeless is a recessive gene on chromosome 4 of Drosophila melanogaster. Flies homozygous for ey have tiny eyes or no eyes at all. A male fly trisomic for chromosome 4 with genotype + / +/ey is crossed with a normal, diploid eyeless female.

What proportion of their progeny will be eyeless?

A. 1/6

B. 1/3

C. 1/2

D. 2/3

E. 1/8

F. 1/4

G. 3/8

H. 5/8

I. 3/4

+2
Answers (1)
  1. 17 September, 08:08
    0
    A. 1/6

    Explanation:

    A male fly trisomic for chromosome 4 with genotype + / +/ey is crossed with a normal, diploid eyeless female. i. e

    δ + / +/ey ey/ey ⊕

    +, +, + / +, ey, + / ey, + / ey * ey/ey

    ey/+, + / ey, + / +/ey, ey/ey, + / ey/ey, + / ey/ey

    ey/+, + / ey, + / +/ey, ey/ey, + / ey/ey, + / ey/ey

    =2/12

    =1/6
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Home » Biology » Eyeless is a recessive gene on chromosome 4 of Drosophila melanogaster. Flies homozygous for ey have tiny eyes or no eyes at all. A male fly trisomic for chromosome 4 with genotype + / +/ey is crossed with a normal, diploid eyeless female.
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