In fruit flies, the color of the eyes is sex linked (on the X chromosome). Complete the cross of the flies in the image to determine the possible offspring produced. (Homozygous white eyed female x red eyed male)
Red eyes are dominant (R), White eyes are recessive (r).
What percentage of the male offspring are expected to have red eyes?
a
100%
b
75%
c
50%
d
25%
e
0%
The genotypes of the parents would be:
Female (homozygous white eyed): X^rX^r
Male (red eyed): X^RY
The possible offspring are:
- X^R X^r (red eyed females)
- X^R X^r (red eyed males)
- X^rY (white eyed males)
Therefore, 50% of the male offspring are expected to have red eyes.
c) 50%