Question

the letters a and a represent alleles of a single gene. similarly, b and b represent alleles of another gene. which combinations of alleles are possible in the gametes formed after meiosis if crossing - over does not occur?

Explanation:

Step1: Recall law of independent assortment

During meiosis without crossing - over, alleles of different genes assort independently.

Step2: Determine possible allele combinations

For the A/a gene and B/b gene, the possible gamete combinations are AB, Ab, aB, ab.

Answer:

The possible combinations of alleles in the gametes are AB, Ab, aB, ab.