Difference between Homozygous and Heterozygous:
| Homozygous | Heterozygous |
| 1. Possess identical alleles of a gene (TT) | 1. Possess dissimilar or contrasting alleles of a gene (Tt) |
| 2. Produce only one type of gametes (T only) | 2. Produce two types of gametes (T and t) |
| 3. Bread true to the particular character, all the offspring possess the same genotype and phenotype when such parents are self-pollinated. | 3. Produce three different genotypes when self-pollinated which may have two or three different phenotypes. |