In the Individual with Genotype AaBB, What Percentage of Gametes

Question

In the individual with genotype AaBB, what percentage of gametes will contain the A allele?
A) 75 percent
B) 25 percent
C) 100 percent
D) 10 percent
E) 50 percent

Accepted Answer

In the genotype AaBB, the A allele can be passed on from the Aa part of the genotype. Since gametes are formed through meiosis, each gamete gets one allele from each gene pair. Therefore, 50% of the gametes will contain the A allele (from the Aa pair), and the other 50% will contain the a allele. The BB genotype does not affect the distribution of the A allele.