Answer:
The probability of crossover occurring between two genes on a chromosome is inversely proportional to the distance between them.
This is because the process of crossover or recombination is more likely to occur between genes that are farther apart on a chromosome as there is a larger physical distance between them for the process to occur.
Conversely, genes that are closer together on a chromosome are less likely to undergo crossover as there is less physical space for recombination to occur.
Therefore, the probability of crossover between two genes on a chromosome can be used to estimate the relative position of those genes. Genes that have a higher probability of recombination between them are likely to be further apart on the chromosome compared to genes with a lower probability of recombination.
Step-by-step explanation: