Determine the expected phenotypes and genotypes

Home Blog Determine the expected phenotypes and genotypes

Determine the expected phenotypes and genotypes

In parakeets, two genes control feather color. One of the genes determines whether a yellow pigment is made, and the other determines whether a blue pigment is made. If both the yellow and blue pigments are produced, the feather color is green. If no pigment is made, the feathers are white. The relevant genotypes:
Y_ B_ = green
Y_ bb = yellow
yy B_ = blue
yy bb = white
a. A white parakeet is crossed with a true-breeding yellow parakeet. What are the expected phenotypes and genotypes of the F1?
b. A male yellow parakeet from the F1 is crossed with a true-breeding female yellow parakeet. What are the expected phenotypes and genotypes from this cross?
c. To your surprise, the results of the cross in part “b” are as follows:
50% males, all of whom are yellow
50% females, half of whom are yellow and half of whom are white

Add comment

Academic Research Pro