Genotypes help pleaseeeeee!!?

Do you see how to use Peter's answer? Each parent is heterozygous, meaning one form of each gene (so = Aa). Each parent will provide one allele to the offspring, so either A or a. If the father provides an A and the mother provides an A, the offspring genotype will be AA. Peter shows you all four possible combinations: AA, Aa, aA, and aa (I'm showing the father allele first in each offspring pair). You can see that the four possible combinations work out to only three possible genotypes (AA, Aa and aa, with Aa comprising half of the genotypes). Now, suppose one parent was zygous for a, while the other was heterozygous (Aa). Can you set up a Punnett square and work it out for this? Your parental genotypes are aa and Aa, right? So what are the four possible combinations? (Note - this time there will be only two possible genotypes; what are the relative ratios of the two genotypes?)