Purple eyes is a dominant autosomal mutation found on chromosome 3 of Drosophila

Question

Purple eyes is a dominant autosomal mutation found on chromosome 3 of Drosophila. Eyeless is a recessive autosomal mutation found on chromosome 2. A true-breeding purple-eyed male is crossed with a true-breeding eyeless female (assume that she has no purple alleles, but instead has the normal red-eyed alleles): A. What are the genotypes of the P1 flies (use correct genetic symbols)? (2 points) B. What would be the genotype and phenotype of the F1 progeny? (2 points) C. If a F1 female is mated to a red-eyed male whose mother was eyeless, use the forkline method to determine: 1) the expected phenotypic ratio of their progeny, and 2) the expected genotypic ratio of their progeny. Show your work! (13 points) Phenotypic forkline

Explanation / Answer

A). If RR- red, Rr or rr- purple and EE or Ee- eye, ee-eyeless

male- XrEY and female- XReXRe in P1

B).

XRe

XRe

XrE

XRe XrE

purple, eye

XRe XrE

purple, eye

Y

XRe Y

red, eyeless

XRe Y

red, eyeless

C). I am not acuainte dwith forkline method so sorry for no answer.

XRe

XRe

XrE

XRe XrE

purple, eye

XRe XrE

purple, eye

Y

XRe Y

red, eyeless

XRe Y

red, eyeless

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