Question

If two of the F1 generation from the above cross were mated, what would be the genotypes and phenotypes of the F2?

a) Genotypes: Homozygous dominant, Heterozygous; Phenotypes: Dominant, Recessive
b) Genotypes: Homozygous dominant, Homozygous recessive; Phenotypes: Dominant, Recessive
c) Genotypes: Heterozygous, Heterozygous; Phenotypes: Recessive, Dominant
d) Genotypes: Homozygous recessive, Homozygous recessive; Phenotypes: Recessive, Recessive

Answer 1

The F₂ generation from two heterozygous F₁ individuals produces genotypes of homozygous dominant, heterozygous, and homozygous recessive, with a phenotypic ratio of three dominant to one recessive.

Step-by-step explanation:

If two heterozygous F₁ individuals are mated, the genotypes and phenotypes of the resulting F₂ generation can be predicted. The genotypes will include homozygous dominant, heterozygous, and homozygous recessive. As for the phenotypes, because the homozygous dominant and heterozygous genotypes both express the dominant trait, we expect to see a phenotype ratio of three dominant to one recessive. Therefore, the correct answer is: Genotypes: Homozygous dominant, Heterozygous, Homozygous recessive; Phenotypes: Dominant, Recessive, which is not explicitly listed in the options but implied within option b) referring to all three genotype possibilities.