Final answer:
The student's question relates to meiosis and the formation of gametes. For the genotype AaBb, the four types of gametes produced are AB, ab, Ab, and aB.
Step-by-step explanation:
The question pertains to the process of meiosis, specifically the types of gametes produced during this cell division. 4 chromatids are present after DNA replication in a parent cell, thereby creating sister chromatids. During meiosis, these sister chromatids are separated into different gametes. For an individual with the genotype AaBb, the process will produce two types of gametes that are AB and ab, and another two that are Ab and aB. This is a result of independent assortment where alleles for different genes segregate independently of one another during gamete formation.