What type of genetic cross involves two different alleles, such as Ab x aB?

The correct answer is based on the understanding of genetic crosses and the types of alleles involved. In this scenario, the cross features two different alleles represented by "Ab" and "aB." This indicates that each parent contributes two different traits, which aligns with the definition of a hybrid cross.

A hybrid cross typically involves parents that are heterozygous for two traits, meaning they carry different alleles for those traits. The combination of alleles from "Ab" and "aB" signifies variation in two characteristics, supporting the idea of a hybrid cross.

While a monohybrid cross focuses on a single trait involving two alleles, a dihybrid cross involves two traits with four possible combinations of alleles. A test cross is designed to determine the genotype of an individual by crossing it with a homozygous recessive individual. Given the specifics of the question, identifying the cross type as a hybrid cross is accurate because it captures the essence of dealing with two different alleles for traits in the parental generation.