Final answer:
For linked genes A and B with a single crossover, approximately 50% of the gametes will be recombinant, reflecting the genetic distance and recombination frequency between them.
Step-by-step explanation:
When genes A and B are linked and a single crossover occurs in an individual with genotype Aa Bb, the proportion of resulting gametes that are recombinant is expected to be 50%. This assumes typical linkage without interference and that the two genes are far enough apart for crossovers to occasionally occur. It is important to note that this is an average estimation, as the actual frequency of recombination can vary depending on the specific genetic distance between the two genes in question.
In general, during meiosis, linked genes tend to be inherited together. However, recombination can occur, leading to the exchange of alleles between homologous chromosomes. The recombination frequency, or the proportion of recombinant gametes, is correlated with the genetic distance between linked genes. In cases where the recombination rate is 10% (10 crossovers per 100 meiotic events), we predict about half of the gametes to be recombinant (AB and ab) and half to be parental (Ab and aB), leading to a 1:1 ratio of recombinant to parental gametes.