Linkage - molecular basis

Diagram of recombination prior to gametogenesis

If a marker allele and disease mutation lie close together on the same chromosome they are unlikely to be separated by crossovers during meiosis.

For loci far apart or on different chromosomes recombination will occur by chance in 50% of meioses. The closer the recombination fraction is to 0 the more tightly linked are the loci.

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