Crossovers and Recombination
Crossover may occur at different locations on the chromosome. Recombination between genes A and B is more frequent than recombination between genes B and C because genes A and B are farther apart; a crossover is, therefore, more likely to occur between them.
Source
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"OpenStax College, Mapping Genomes. October 16, 2013."
http://cnx.org/content/m44554/latest/Figure_17_02_01.jpg
OpenStax CNX
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