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In Drosophila, the gene for red eyes, R is dominant to the allele for white eyes , r. This is sex-linked . Determine the possible genotype and phenotype ratios expected from a cross between:

In Drosophila the gene for red eyes R is dominant to the allele for white eyes r This is sexlinked Determine the possible genotype and phenotype ratios expected class=

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Answer:

B) XRxr XrY

XRXr,XRY,XrXr,XrY

Genotype ratio:1:1:1:1

Phenotype ratio: 2:2 50% white, 50% red

C) XRXR, XrY

XRXr,XRY,XRXr,XRY

Genotype: 2:2

Phenotype: 100% white

D) XRXR,XRY

XRXR,XRXR,XRY,XRY

Genotype: 2:2

Phenotype: 100% white

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