Single-gene speciation with pleiotropy: effects of allele dominance, population size, and delayed inheritance.

Abstract excerpt

Single-gene speciation is considered to be unlikely, but an excellent example is found in land snails, in which a gene for left-right reversal has given rise to new species multiple times. This reversal might be facilitated by their small population sizes and maternal effect (i.e., "delayed inheritance," in which an individual's phenotype is determined by the genotype of its mother). Recent evidence suggests that...

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