Scalloped (sd) is an x-linked recessive and ebony (e) is an autosomal recessive mutation. what proportion of scalloped, ebony females (relative to whole population) is expected in the f2 starting with a true breeding scalloped female which is wild type for ebony mating with a true breeding male mutant only for ebony.

1/16

Explanation:

The two genes are independent because they are located on different chromosomes.

True breeding scalloped female wild type for ebony (Xsd Xsd e+e+) mates with a true breeding male mutant only for ebony (Xsd+ Y ee).

The female only produces Xsd e+ gametes. The male produces Xsd+ e or Y e gametes. Therefore, the F1 females will have the genotype Xsd Xsd+ e e+ and the F1 males will have the genotype Xsd Y e e+.

If you complete a Punnett Square with the gametes the two F1 individuals can produce, you will get all the F2 proportions. The scalloped, ebony females have a Xsd Xsd e e genotype and appear in a 1/16 proportion.

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