Hereditary Test

Question

If a homozygous recessive individual is crossed with a heterozygous individual, what is the percent probability of them having a homozygous dominant offspring?

Answer 1

0% probability to have homozygous it means both allele are same, if you cross a hetezygous dominant (Aa) with homozygous recessive(aa) it is called test cross there is no way to get an homozygous dominant in this case as the gamete from one parent will always lack the required dominant allele

Answer 2

Hey! Homozygous recessive for a trait is aa (where A is dominant and a is recessive), because "homo" is "same". Heterozygous is "different" bc "hetero" means different. This means that they have different alleles - A and a, so they are Aa. If you cross aa and Aa (make a Punnet square, I can't really do that here), then your offspring is Aa, aa, Aa, and aa. So out of these, you do not have any homozygous dominant (which is AA). This means that the chance of having them is 0%. Does this make sense??