Final answer:
The frequency of crossing over is related to the distance between linked genes on a chromosome, with genes farther apart having a higher chance of recombination.
Step-by-step explanation:
The frequency of crossing over is directly related to the distance between linked genes on a chromosome. If two genes are located close together, they are less likely to be separated by a crossover event during meiosis, and as a result are often inherited together. However, as the distance between two genes increases, the probability of crossovers between them also increases, which can lead to a higher frequency of recombination, making the genes behave more independently from one another.
Therefore, the correct statement about crossing over of genes is: b. Frequency of crossing over is related to the distance between linked genes. Genes that are far apart on a chromosome are more likely to be separated by a crossover event, leading to a higher recombination frequency and independent assortment behavior.