2. Eye color in certain species of flies is controlled by a single pair of genes

Question

2. Eye color in certain species of flies is controlled by a single pair of genes. A white-eyed fly, both of whose parents had white eyes, was crossed with a red-eyed fly, and all of their offspring (both male and female) were red-eyed. -4 points a. Is the gene for red eyes or that for white eyes dominant? Proof? b. What was the genotype of the white-eyed parents? c. What was (were) the genotype(s) of the red-eyed offspring? parent, what would be the expected ratio of offspring, with respect to eye color?

Explanation / Answer

Answer:

2).

a). Red eye is dominant over white eyed

RR (red) x rr (white)--Parents

Rr (red eyes)---offspring

In this phenomena, red eye allele (R) masks the expression of white eye allele (r) as the law of dominance.

b). white-eye parent genotype = rr

c). Red-eye offspring genotype is Rr

d)

Rr (red-eye offspring) x rr (white-eyed parent)-----Testcross

Red (1) : white (1) = 1:1

r R Rr (red-eyed) r rr (white-eyed)

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