If a male fly hemizygous for the recessive x-linked white mutation (w) is mated to a female fly heterozygous for white, and the phenotypically white f1 are intercrossed, which will be true:
a. half of both the f2 males and females are red
b. all of the f2 are red all of the f2 males are red, all of the f2 females are white
c. all of the f2 are white
d. all of the f2 males are white, all of the f2 females are red

c. All of the F2 are white

Explanation:

The white mutation is recessive and located in the X chromosome.

White male fly

Genotype: XʷY

Gametes: Xʷ and Y

Heterozygous female fly

Genotype: Xʷ⁺Xʷ

Gametes: Xʷ⁺ and Xʷ

Possible F1 genotypes and phenotypes:

The white F1 indiviudals are:

Female XʷXʷ . Gametes: Xʷ

Male XʷY. Gametes: Xʷ and Y

Possible F2:

All F2 are white.

regulation of gene expression. gene expression can be regulated by various cellular processes with the aim to control the amount and nature of the expressed genes. these regulatory proteins bind to dna and send signals that indirectly control the rate of gene expression

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