homozygous
A dominant trait is expressed when two different genes for the same trait are present.
recessive trait
homozygous
Alleles
Alleles
dominant
recessive
homolegous chromosomes
heterozygotes
dominant
recessive
What is heterozygous? Your inherited characteristics are determined by your genes. Zygosity refers to the similarity of genes for a trait in an organism. If both genes are different, the organism is heterozygous (hetero = different) for that trait. If both genes are the same, the organism is homozyous (homo = same).