However in a few hereditary disorders heterozygous individuals may suffer from a milder version of the disease.Homozygous vs HeterozygousIf we assign a letter such as B to a dominant genetic or hereditary trait then b will be a defective allele:So,If homozygous genotypes are represented by BB (normal) and bb (affected) and heterozygous genotypes are represented by Bb (carrier genotype)Below are ex