if an organism with the genotype aabb produces gametes, what proportion of the gametes would be bb?

The proportion of gametes that are bb is 0 (none).

Key idea

• An organism with genotype aabb is diploid, meaning it has two copies of each gene.

• When it makes gametes, meiosis separates each pair of alleles so that each gamete gets only one allele for each gene, not a pair. This is Mendel’s law of segregation.

Applying it to aabb

• For the “A/a” gene: genotype is aa, so every gamete gets a single a.

• For the “B/b” gene: genotype is bb, so every gamete gets a single b.

So each gamete is ab, not aa, bb, or aabb.

Because a gamete can only carry one allele per gene, “bb” is not a valid gamete genotype; it would mean two copies of the B-gene allele in one gamete, which does not occur in normal meiosis.

Therefore, the proportion of gametes that would be bb is 0.

Information gathered from public forums or data available on the internet and portrayed here.