the genotype will be uniformly heterozygous. If we track one gene, call it A, and the organisms are diploid, it will be like AA x aa. You cannot get anything else from this than Aa = heterozygote
homozygous dominant means two alleles that are the same that are capital letters, heterozygous recessive means that to alleles are different BUT the same letters in lower case. (alleles for gender)...