A single-locus model of speciation

Acta Biotheoretica 40 (4):313-319 (1992)
  Copy   BIBTEX


The crucial phase of speciation is argued to be the evolution of mating cross-incompatibility (prezygotic incompatibility) between the genotypes distinguishing the prospective species populations. Based on this idea, a single-locus model of speciation is presented, which is shown to be biologically plausible and may help to settle the controversy as to the biological significance of single-locus modes of speciation. The model involves three alleles, two of which characterize in homozygous state the prospective species populations and in heterozygous state their hybrids. The third allele represents a mutant which is equivalent to one of the first two alleles with the exception that it inhibits mating with carriers of the third allele. This third allele is fixed in one population and immigrates into a second population which contains the mutant inhibiting matings with members of the former population. Migration in the reverse direction does not occur. Proceeding from a widely applicable concept of fitness and mating preference it is shown that postzygotic incompatibility (hybrid or heterozygote disadvantage) alone suffices to trigger evolutionary replacement of the extant mating relations in the population receiving immigrants by any arbitrary degree of prezygotic incompatibility. This corroborates Wallace's hypothesis and emphasizes the potential biological relevance of speciation by reinforcement (parapatric speciation) at single gene loci.



    Upload a copy of this work     Papers currently archived: 93,745

External links

Setup an account with your affiliations in order to access resources via your University's proxy server

Through your library

Similar books and articles

Speciation and Macroevolution.Anya Plutynski - 2008 - In Sahorta Sarkar & Anya Plutynski (eds.), Companion to the Philosophy of Biology. Blackwell. pp. 169–185.
Evolution without change in Gene frequencies.David Magnus - 1998 - Biology and Philosophy 13 (2):255-261.
The cladistic solution to the species problem.Mark Ridley - 1989 - Biology and Philosophy 4 (1):1-16.
Classes or Individuals? The Paradox of Systematics Revisited.Alessandro Rapini - 2004 - Studies in History and Philosophy of Science Part C: Studies in History and Philosophy of Biological and Biomedical Sciences 35 (4):675-695.


Added to PP

47 (#105,769)

6 months
5 (#1,552,255)

Historical graph of downloads
How can I increase my downloads?

Citations of this work

No citations found.

Add more citations

References found in this work

No references found.

Add more references