= Ph1 locus
{c}
The wheat <Ph1 locus> regulates pairing and <genetic recombination> during <meiosis>. In a <genome> containing related <chromosome> sets, appropriate pairing helps maintain regular inheritance while limiting exchange between related but nonhomologous <chromosomes>.
Experiments distinguish effects on <chromosome synapsis> from effects on the later formation of <chromosomal crossovers>. That distinction matters for <plant breeding>: increasing useful exchange need not be equivalent to removing every constraint on pairing.<Dual effect of the wheat Ph1 locus on chromosome synapsis and crossover by Azahara C. Martín and others>[2017, abstract and comparison of synapsis/crossover effects]{ref}
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