Hello! I am pretty sure it was one form of epistatic. However, I am unsure on ho

Question

Hello! I am pretty sure it was one form of epistatic. However, I am unsure on how to tell which is which?

The wild-type (W) abraxas moth has large spots on its wings, but the lacticolor (L) form of this species has very small spots. Crosses were made between strains differing in this character, with the following results: Parents Progety CrossFF Which of the following statements regarding the inheritance of this trait is true? (o one of the alleles is recessive lethal This is an example of autosomal inheritance O none of the above O The small spot phenotype is epistatic to the large spot The large spot phenotype is epistatic to the small spot The allele for large spots is dominant

Explanation / Answer

The size of the spots in the Abraxas moth is sex linked. Moths have heterozygous females(ZY) and homozygous males(ZZ).

Now lacticolor females are homozygous for the recessive L and males are homozygous for the dominant allele W. Now from the given cross it is evident that spotting pattern in Abraxas moth is controlled by gene present on the Z chromosome. And Epistatic(epistasis) is NOT sex-linked.

Hence the option, none of the above is most appropriate.

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