When allele A is dominant over allele A', write out the parental
phenotypes and genotypes. Then write out the offspring phenotypes and genotypes
as well as the number of each.
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AA = Homozygous dominant
AA` = Heterozygous
A`A` = Homozygous recessive
AA & AA` = Display dominant A
A`A` = display recessive A`
For offspring, as follows:
AA x AA = Both parents hom. dominant. All offspring homozygous dominant.
A`A` x A`A` = Both parents hom. recessive. All offspring hom. recessive.
AA x AA` = 2/4 offspring hom. dominant; 2/4 offspring het. dominant
AA x A`A` = All offspring het. dominant
AA` x AA` = 1/4 offspring hom. dominant; 2/4 offspring het. dominant; 1/4 offspring hom. recessive
AA` x A`A` = 2/4 offspring het. dominant, 2/4 offspring hom. recessive.
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