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A recombinase only active during meiosis - Dmc1 and a general recombinase Rad51 coat the single-stranded DNA to form nucleoprotein filaments. These filaments hold the homologs together at the chiasma, the point of attachment during crossing over.


This phenomena is known as achiasmy, where recombination is absent in one sex in a species. The Haldane Huxley rule states that in achiasmic species, the sex without recombination will always be the heterogametic sex (XY or ZW). This is basically the only consistent rule relating to recombination. There seem to be exceptions to every other theory and pattern ...

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