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Recombination does not make any two genes completely independent because there will not systematically be a recombination event between two given loci (=position on the chromosome). Distance between loci Consider two scenarios that describe the position of two loci on a chromosome. Tightly linked loci Consider two very closely linked loci. Let's say ...


No specific length for centromeres. Actually in a real chromosome in a cell, centromeres are usually very condensed sequences of DNA, they are winded and folded (if you know about the DNA structure). Thus you cannot measure the length of the centromere unless you decondense the chromosome first.

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