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When genes are on the same chromosome but very far apart, they assort independently due to crossing over (homologous recombination). This is a process that happens at the very beginning of meiosis, in which homologous chromosomes randomly exchange matching fragments.

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6y ago
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15y ago

If two genes are close together, (since crossing is rare) the recombination frequency should be low...

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Q: How does crossing over make gene mapping possible?
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