Which genotype is heterozygous?

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Multiple Choice

Which genotype is heterozygous?

Explanation:
Two different alleles for the same gene define heterozygosity. Here, T and t are the two alleles. A diploid individual can have TT, Tt, or tt. TT has two identical dominant alleles and is homozygous for the dominant allele; tt has two identical recessive alleles and is homozygous for the recessive allele. Tt has one of each allele, making it heterozygous. So the genotype with one dominant and one recessive allele is the heterozygous one. The other options describe homozygous genotypes, and 'None' would be incorrect because a heterozygous combination exists among the choices.

Two different alleles for the same gene define heterozygosity. Here, T and t are the two alleles. A diploid individual can have TT, Tt, or tt. TT has two identical dominant alleles and is homozygous for the dominant allele; tt has two identical recessive alleles and is homozygous for the recessive allele. Tt has one of each allele, making it heterozygous. So the genotype with one dominant and one recessive allele is the heterozygous one. The other options describe homozygous genotypes, and 'None' would be incorrect because a heterozygous combination exists among the choices.

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