Homozygous and Hererozygous.
| Homozygous | Heterozygous | |
| 1. |
Organisms having
identical alleles for a character are homozygous. |
Organisms having
dissimilar alleles for a character are heterozygous. |
| 2. | It is pure or true breeding | It is hybrid |
| 3. | They form only one type of gamete | They form more than one type of gametes. |
| 4. | e.g. Tall (TT), Dwarf (tt). | e.g. Tt. |