The correct statement that explains why a parent that is heterozygous for two different traits (AaBb) can pass any combination of two alleles (AB, Ab, aB, or ab) to its offspring is:
The alleles of different genes separate independently of one another during gamete formation.
This principle is known as the law of independent assortment, which states that the alleles for different traits are distributed to gametes independently of one another, allowing for a variety of combinations in the offspring.