Homozygote (= Homozygous) It is an organism which possesses similar or identical factors of a character or trait (e.g., TT for tallness or tt for dwarfness). Homozygous individual is also called pure for that character since it breeds true or produces on offspring similar to it in case of self-fertilization or self-breeding.
Heterozygote (= Heterozygous) It is an organism which has two contrasting factors or alleles of a character. Heterozygote or heterozygous individual is also called hybrid, e.g., hybrid tall Pea plant (Tt). It seldom breeds true.