Biology 10th Edition by Eldra Solomon,Charles Martin,Diana Martin,Linda Berg

تمرين 2

The F 1 flies described in question were mated with browneyed flies from a true-breeding line. What phenotypes would you expect the off spring to have?
A) all red eyes
B) all brown eyes
C) half red eyes and half brown eyes
D) red-eyed females and brown-eyed males
E) brown-eyed females and red-eyed males
Question
One of the autosomal loci controlling eye color in fruit flies has two alleles, one for brown eyes and the other for red eyes. Fruit flies from a true-breeding line with brown eyes were crossed with flies from a true-breeding line with red eyes. The F 1 flies had red eyes. What conclusion can be drawn from this experiment?
A) these alleles underwent independent assortment
B) these alleles underwent segregation
C) these genes are X-linked
D) the allele for red eyes is dominant to the allele for brown eyes
E) all of the preceding are true