Which genotype represents a heterozygous individual?

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Multiple Choice

Which genotype represents a heterozygous individual?

Explanation:
Heterozygous means having two different alleles at the same gene locus. Here the two possible alleles are A and a, so the combination Aa has one of each. That makes it heterozygous. The other options use two identical alleles at the locus (AA or aa) or two copies of a different allele (BB), which are all homozygous. Therefore, Aa is the heterozygous genotype.

Heterozygous means having two different alleles at the same gene locus. Here the two possible alleles are A and a, so the combination Aa has one of each. That makes it heterozygous. The other options use two identical alleles at the locus (AA or aa) or two copies of a different allele (BB), which are all homozygous. Therefore, Aa is the heterozygous genotype.

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