Which genotypes are homozygous for a trait with two alleles?

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Multiple Choice

Which genotypes are homozygous for a trait with two alleles?

Explanation:
Homozygous means having two identical alleles for a gene. In a two-allele system, the possible genotypes are TT, Tt, and tt. The two identical-allele combinations are TT and tt, so those are homozygous. The one with different alleles, Tt, is heterozygous. This distinction holds regardless of which allele is dominant or recessive.

Homozygous means having two identical alleles for a gene. In a two-allele system, the possible genotypes are TT, Tt, and tt. The two identical-allele combinations are TT and tt, so those are homozygous. The one with different alleles, Tt, is heterozygous. This distinction holds regardless of which allele is dominant or recessive.

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