Final answer:
The true statement is that genes on nonhomologous chromosomes are expected to assort independently. Linked genes on the same chromosome tend to be inherited together but can be separated by crossing over during meiosis, especially if they are far apart.
Step-by-step explanation:
The statement that is true is: B) If two gene loci are on nonhomologous chromosomes, genes at these loci are expected to assort independently. This is because genes on separate chromosomes do not influence each other's segregation into gametes and follow Mendel's law of independent assortment. On the other hand, genes located on the same chromosome are linked, which means they tend to be inherited together unless crossing over occurs during meiosis.
When two genes are linked, they are in close proximity on the same chromosome, and the probability of these genes being separated by a crossover event during meiosis is proportional to the distance between them. As distance increases, the likelihood of crossing over also increases, which leads to recombination. Therefore, the greater the distance between two linked genes, the more they will behave as if they are on separate chromosomes, and the more recombinant gametes will be observed, which can contribute to genetic variation.