Eyeless is a recessive gene (ey) on the fourth chromosome of Drosophila. A male trisomic for...
Eyeless is a recessive gene (ey) on the fourth chromosome of Drosophila. A male trisomic for chromosome 4 with the genotype +eyey is crossed to a disomic eyeless female of the genotype +ey. What is the phenotypic ratio expected among the progeny?
a. 3 wildtype : 1 eyeless
b. 4 wildtype : 1 eyeless
c. 5 wildtype : 1 eyeless
d. 1 wildtype : 1 eyeless
e. 2 wildtype : 1 eyeless
Homework Answers
A option
Male geneotype +eyey (trisomic) and female +ey (heterogygous)
+eyey X +ey
I
+ eyey or +ey ey + ey (femalegamete formation)
(Male gamete formation)
I
After crossing
++ +eyey. +ey. eyeyey (3 wildtype:1 eyeless)
Or
++ey. +ey. +eyey. eyey (3 wildtype:1eyeless)
So A option correct
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