The exchange of identical regions between homologous chromosomes, or, in another way, crossing over

The exchange of identical regions between homologous chromosomes, or, in another way, crossing over, allows scientists to determine the relative position of genes in the chromosome. The farther apart the genes are located on the chromosome, the higher the probability of crossing over between them.
What is the biological significance of the exchange of homologous regions between chromosomes.

Due to crossing over, each cell receives a different set of genes, thus combining variability increases. Thanks to crossing over, species diversity is maintained and the population’s resistance to environmental factors is increased.

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