Final answer:
The maximum recombination frequency between two genes is 50%, reflecting independent assortment, similar to genes on separate chromosomes or far apart on the same chromosome; thus the answer is (e) none of these choices.
Step-by-step explanation:
The maximum recombination frequency between two genes that can be observed is 50%. This occurs when the genes are either on different chromosomes or are located very far apart on the same chromosome. Thus, the correct answer to the student's question is option (e) none of these choices.
In more detail, a recombination frequency of 0% indicates perfect linkage, meaning that the genes are inherited together every time. As the distance between two genes on a chromosome increases, the chance of a recombination event during meiosis also increases. However, once the frequency reaches 50%, it reflects a scenario where the genes assort independently, just like they would if they were on separate chromosomes. Therefore, the recombination frequency between two genes will never exceed 50%, as this would be indistinguishable from independent assortment.