Cross Category 2: P1 - virgin white-eyed females x P2 - sepia-eyed males A) Are

Question

Cross Category 2: P1 - virgin white-eyed females x P2 - sepia-eyed males

A) Are the genes for white eyes and sepia eyes dominant or recessive?

B) Give the genotypes of P1 white-eyed females and P2 sepia-eyed males. Note: remember that two different genes are responsible for the white and sepia phenotypes.

C)Based on your answer to the previous question, please provide the expected phenotype and genotype of the F1 flies. Show your work. 16

D)What are the expected F2 phenotypic and genotypic ratio expected by crossing the F1 males and females? Show your work.

Explanation / Answer

A) The genes for white eyes and sepia eyes are recessive.

B)

P1 white eyed females : XwXw

P2 sepia eyed males:XsY

C) male

F1 genotype : XsXw : XwY = 2:2 =1:1

F1 phenotype = wild type eyed female: white eyed male = 2:2=1:1

D)

F2: male

Genotype ratio = XsY : XsXw: :XwY = 1:2:1

Phenotype ratio=sepia eyed male: wild type eyed female:white eyed male = 1:2:1

female Xs Y Xw XsXw wild type eyed female XwY white eyed male Xw XsXw  wild type eyed female XwY white eyed male

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