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. 2021 Jan 26;23(6):562–571. doi: 10.4103/aja.aja_86_20

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Copyright: © The Author(s)(2021)

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The co-variation of chromosome axis lengths results in the co-variation of crossover numbers. (a) Correlation between crossover number and chromosome DNA content in male mice. (b) Correlation between crossover number and chromosome axis length in male mice (data provided by Lorida Anderson). (c) Representative human male pachytene nuclei to show co-variation of axis lengths and covariation of crossover numbers among chromosomes within individual nuclei. Left nucleus: 37 COs; 170 micron (axis length). Right nucleus: 61 COs; 230 micron (axis length). Scales bars=5 μm. (d) Cartoon to show co-variation of axis lengths leads to co-variation of crossover numbers. CO: crossover; NCO: noncrossover; Chr: chromosome; MLH1: MutL homolog 1; SYCP1: Synaptonemal complex protein 1; CREST: Calcium-responsive transactivator.