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 with a true-breeding eyeless female (assume that she has no purple alleles, red-eyed alleles): but instead has the normal 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) ine method If a F1 female is mated to a red-eyed male whose mother was eyeless, use the forkl to determine: 1) the expected phenotypic ratio of their progeny, and 2) the expected genotypic ratio of their progeny. Show your work! (13 points) C.

Explanation / Answer

Given Data:

1] Purple eyes is a dominant autosomal mutation = CP

2] Eyeless is a recessive autosomal mutation = pp.

A true breeding puple eyed male is crossed with a true breeding eyeless female

Parent: CP x Pp

Offspring: CP Cp Pp pp

This cross shows 1:2:1 ratio, CP will be purple, Cp and Pp will be red colored and pp will be eyeless one.

A. Genotypes of the P1 flies are Cp and Pp.

B. The genotype and phenotype of the F1 progeny are:

Genotype of the F1 progeny is 1:1 i.e. Cp, Cp, Pp, Pp.

Phenotype is: all are red colored.

C. If a F1 female is mated to a red eyed male:

Parent: Cp x Pp

Offsprings: CP Cp Pp pp

This cross shows 1:2:1 ratio, CP will be purple, Cp and Pp will be red colored and pp will be eyeless one. In this question, there is no indication of progeny nature, so we can not mention the expected progeny. In general, we can say that the genotypic ratio is 1:2:1 and phenotypic ratio is 3:1.

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