Question

A black guinea pig crossed with a guinea pig with albinism produced 12 black offspring When the albino was crossed with a second black animal, six blacks and six albinos were obtained. What is the best explanation for this genetic situation? (A) Albinism is a recessive trait; black is a dominant trait. (B) Albinism is a dominant trait; black is incompletely dominant. (C) Albinism and black are codominant. (D) Albinism is a recessive trait; black is codominant.

Answer 1

The best explanation for the creation of six blacks as well as six albinos from the given cross is that (A) Albinism is a recessive trait; black is a dominant trait.

Albinism is a recessive trait. It is expressed only in an individual's genotype contains a pair of the recessive allele 'a', that is responsible for causing albinism.

Black skin color in guinea pig is a dominant trait which does not allows the recessive trait to be expressed.

Thus, guinea pigs having the genotype 'aa' will exhibit albinism while those having the dominant allele for black color will have black skin color.

To learn more about Albinism here

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