Selection for linkage modification. I. Random mating populations.

Abstract The diploid system with chromosomes MAB, MAb, MaB and Mab is at equilibrium under selection and recombination between A a and B b loci. The M locus controls this recombination. Using local analysis near the original equilibrium, the fate of a selectively neutral recombination modifying allele ‘m’ introduced at the ‘M’ locus is investigated in the cases where the selective regimes are additive, multiplicative and symmetric. It is found that if initially there is linkage disequilibrium, ‘m’ will increase if it produces tighter linkage between the other two loci. The existence of epistasis, either additive or multiplicative, is shown not to be sufficient for recombination to be modified at a geometric rate.

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