Assuming independent genes and normal meiotic events, the gametes of an individual with genotype aabb are ab, ab, ab, ab. There are no bb gametes. The answer is NONE.
A gamete is a haploid cell that results from the meiotic division of germ cells during gametogenesis.
These haploid cells have half the number of chromosomes of somatic and germ cells, and their destiny is to merge with another gamete to produce a new diploid cell.
During gamete formation, homologous chromosomes separate after crossing over, and finally, sister chromatids separate too, resulting in four haploid cells, each of them with a different allele combination.
When genes are in different chromosomes or far from each other in the same chromosome, they express independent assortment during meiosis. These genes are independent.
Independent assortment means that during a meiotic event, alleles from two or more different genes distribute in gametes independently from each other.
Each gamete receives an allele of a gene that does not depend on nor influence the allele of another gene in the same gamete.
In the exposed example, the homozygous recessive genotype is composed of two diallelic genes ⇒ aabb
Assuming independent genes, unless there is some sort of problem during meiosis, there are no gametes bb, because gametes result from the combination of both genes.
The answer is NONE. There are no gametes bb.
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