Question

What does F1 means in punnett squares?

Answer 1

I found this...hope it helps

The F1 is the generation resulting from a cross between two parents. For example, usually you will see a problem that talks about two organisms mating and producing progeny. That progeny is known as the F1. If those progeny are then mated to one another, their progeny is know as the F2. It goes on in this fashion.

So in the case of your question...homozygous means that they contain the same allele for each trait. So lets call the allele for color "A." Lets imagine yellow is the normal phenotype, if I said an organism is homozygous yellow, its genotype would be AA. So in this case, we have two homozygotes, and since only one can be the normal, and thus dominant allele, we know that their gentype must be AA and aa. So if you were to cross these, the resulting progeny (F1) would be all heterozygotes Aa. See the punnet square below:

A A
a Aa Aa

a Aa Aa