DRAW OUT SET UP, CROSSES, PUNNET SQUARES AND GIVE AN EXPLANATION. 1). cinnabar e

Question

DRAW OUT SET UP, CROSSES, PUNNET SQUARES AND GIVE AN EXPLANATION.

1). cinnabar eyes is a sex-linked recessive characteristic in fruit flies. if a female having cinnabar eyes is crossed with a wild -type male, what percentage of the F1 makes will have cinnabar eyes?

2.) In cats black fur color is caused by an x-linked allele; the other allele at this locus causes orange color. the heterozygote is tortoiseshell. what kinds of offspring would you expect from the cross of a black female and an orange male?

Explanation / Answer

1. Female = XcXc

Male = XY (no cinnabar)

Hence XcXc x XY

Hence Answer - 50% (half) of the F1 progeny will have Cinnabar Eyes

2. Male = XoY (ORANGE)

Female= XX (BLACK)

Heterozygotic phenotype = XoX (Tortoiseshell)

Hence, for the cross :- XX x XoY

So, we will only expect Tortoiseshell females and Black Males

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