Question

question 9
10 points
a black guinea pig crossed with an albino guinea pig produced 12 black offspring. when the albino was crossed with a second black one, 7 blacks and 5 albinos were obtained. what is the best explanation for this genetic situation?
a albino phenotype is recessive
b uv radiation causes albinos
c albinism is a codominance phenotype
d genetic heterogeneity

Explanation:

In the first cross, all offspring are black, suggesting the black - trait is dominant over the albino trait. In the second cross, the appearance of both black and albino offspring in a non - 1:1 ratio further supports that the albino phenotype is recessive. The albino guinea pig is likely homozygous recessive, and the black guinea pigs can be homozygous dominant or heterozygous. UV radiation is not indicated as a factor here, and there is no evidence of codominance or genetic heterogeneity.

Answer:

A. albino phenotype is recessive