But how often does cross-over occur?
So far we have been assuming that crossover occurs in 10% of meiosis, but this was just a convenient number, not a general rule. How often cross-over actually occurs depends on how far apart the two genes are on the chromosome.
Why? Crossover is a random process. In other words, where the chromosome gets split is random. Therefore, alleles that are farther apart are more likely to get broken apart:
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