rossing-over frequency between genes is used to construct linkage maps.  True False

Answer: True

Crossing-over frequency between genes is indeed used to construct linkage maps. In genetics, a linkage map is a diagram that depicts genetic loci on a chromosome based on the frequency of recombination (crossing-over) events that occur during meiosis. When two genes are located close to each other on the same chromosome, the likelihood of them being separated during this process is lower, resulting in a lower crossing-over frequency. Conversely, if two genes are far apart, the chances of crossing-over occurring between them increase, leading to a higher frequency of recombination.

This relationship allows geneticists to estimate the distances between genes in units called centimorgans (cM), where 1 cM approximately corresponds to a 1% chance of recombination occurring between two genes during meiosis. By analyzing multiple crosses and their progeny, researchers can create detailed maps that help in understanding gene linkage, inheritance patterns, and traits in organisms.