Bateson–Dobzhansky–Muller model
The Bateson-Dobzhansky-Muller Model[1] is a model of the evolution of genetic incompatibility, important in understanding speciation and the role of natural selection in bringing it about.
The theory was first described by William Bateson in 1909,[2] then independently described by Theodosius Dobzhansky in 1934,[3] and later elaborated in different forms by Herman Muller, H. Allen Orr and Michael Turelli.[4]
The model attempts to explain how incompatibilities between closely related species develop without either of them going through an adaptive valley. In its simplest form the model shows that changes in at least two loci are required to cause hybrid incompatibility, or at least a decrease in fitness between individuals from two ancestrally identical, but allopatric populations. This is based on the idea that a new allele which has arisen at one locus in one population should not cause decreased fitness when placed into the identical (except for one allele) genetic background of the second population. Therefore, another allele at a second locus which is incompatible with the first must have arisen.
References
- ↑ Dobzhansky, Bateson, and the genetics of speciation.
- ↑ Bateson, William (1909). "Heredity and variation in modern lights". Darwin and Modern Science: 85–81.
- ↑ Dobzhansky, Theodosius (1934). "Studies on Hybrid Sterility. I. Spermatogenesis in pure and hybrid Drosophila pseudoobscura". Zeitschrift für Zellforschung und mikroskopische Anatomie. 21: 169–221. Archived from the original on 2012-03-27.
- ↑ Barton, N. H. (June 2010). "What role does natural selection play in speciation?". Philosophical Transactions of the Royal Society B. 365 (1547). doi:10.1098/rstb.2010.0001.