Question

1. using the cross in the problem above, what proportion of their children would be expected to be homozygous?

a. 0 of 4
b. 1 of 4
c. 2 of 4
d. 3 of 4
e. 4 of 4

Explanation:

In genetics, a Punnett - square cross is used to determine the genotypes of offspring. The proportion of homozygous offspring depends on the genotypes of the parents. Without knowing the specific cross from the "problem above", we assume a simple Mendelian cross. If we consider a cross between two heterozygous individuals (e.g., Aa x Aa), the genotypes of the offspring are AA : Aa : aa in a 1:2:1 ratio. The homozygous genotypes are AA and aa. So, out of 4 possible genotypes, 2 are homozygous.

Answer:

C. 2 of 4