Local drift load and the heterosis of interconnected populations.

摘要: We use Wright's distribution of equilibrium allele frequency to demonstrate that hybrids between populations interconnected by low moderate levels migration can have large positive heterosis, especially if the are small in size. Beneficial alleles neither fix all nor equilibrate at same frequency. Instead, reach a mutation-selection-drift-migration balance with sufficient among-population variance some partially recessive, deleterious mutations be masked upon crossbreeding. This heterosis is greatest intermediate mutation rates, selection coefficients, rates and recessive alleles. Hybrid vigour should not taken as evidence for complete isolation populations. Moreover, we show crosses has different genetic basis than inbreeding depression within much more likely result from effect.