Final answer:
A recombination frequency of 50% suggests that two genes are independently assorting, implying they are either on different chromosomes or far apart on the same chromosome, allowing for equal recombinant and parental genotypes. Thus, option A is the correct answer.
Step-by-step explanation:
A frequency of recombination of 50% indicates that two genes assort independently from each other, which can either mean they are located on different chromosomes or they are very far apart on the same chromosome. According to the work of Thomas Hunt Morgan and his student Alfred Sturtevant, when genes have a recombination frequency of 0.5, the resultant offspring exhibit an equal frequency of recombinant and parental genotype, adhering to Mendel's law of independent assortment. In effect, every allele combination between the two genes is equally likely. This means that a frequency of recombination of 50% correlates to genes being either unlinked because they are on separate chromosomes or appearing to be unlinked due to the distance between them on the same chromosome, hence allowing for frequent crossover events.