Punnet square problems Miniature wings (X^d) is a recessive X-linked allele in D

Question

Punnet square problems Miniature wings (X^d) is a recessive X-linked allele in Drosophila melanogaster. Diagram a cross between a pure-breeding miniature-winged female and a normal-winged male, indicating the genotypes and phenotypes of the F_1 and F_2 progeny. Parental cross: _______ Punnet Square: F_1 Genotypic ratio: F_1 Phenotypic ratio: F_1 cross: _____ Punnet Square: F_2 Genotypic ratio: F_2 Phenotypic ratio: A reciprocal cross means that you switch the phenotypes between the sexes from your original cross. Diagram the reciprocal cross for problem #10 through the F_2 generation (in this case, the reciprocal cross would be between a pure-breeding normal-winged female and a miniature-winged male). This problem continues on the next page. Parental cross: ________ Punnett Square: F_1 Genotypic ratio: F_1 Phenotypic ratio:

Explanation / Answer

10) Parental cross: XmXm x XY

F1 Genotypic ratio: 1:1

F1 phenotypic ratio: 1:1 (1 normal winged female: 1 miniature winged male)

F1 cross: XmX x XmY

Punnett square:

F2 genotypic ratio: 1:1:1:1

F2 Phenotypic ratio: 1:1:1:1

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