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Single Answer MCQ
Q-00019413

If a characteristic is controlled by a single gene with two alleles, what are the only possible genotypes?

1

AA and Aa

2

AA and aa

3

Aa and bb

4

AA, Aa, and aa

Answer and Solution

Answer

D. AA, Aa, and aa

Solution:

When a characteristic is controlled by a single gene with two alleles, the possible genotypes are homozygous dominant (AA), heterozygous (Aa), and homozygous recessive (aa).

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