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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If we were to complete Punnet squares for all of the potential parents' genotypes and phenotypes there are 3 different possible genotypes for children and parents with 2 possible phenotypes for each. 


  • AA, homozygous dominant
  • AA', heterozygous
  • A'A', homozygous recessive


  • AA & AA', showing dominant allele A
  • A'A', showing recessive allele A'

All options for crosses are as follows:

  • AAxAA: Both parents hom. dom. with phenotypes showing dominant allele A. This would give 4 hom. dom. children...

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