Spatial models for hybrid zones

Article Abstract:

Spatially explicit models for natural hybrid zones which make possible consideration of how patterns of allele frequencies and linkage disequilibria change with time are discussed. In some situations, differences in hybrid zone origins will bring substantially different pattern of variation. They may last for thousands of generations. It seems that in some circumstances primary intergradation and secondary contact will bring substantially different patterns and variation. Also observations of divergence of neutral loci across hybrid zones and significant linkage disequilibrium in hybrid zones may often be clear in secondary contact.

Stochastic systems, Biogeography

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The likelihood of homoploid hybrid speciation

Article Abstract:

Likelihood of homoploid hybrid speciation is discussed. The mechanisms thought by some to underlie hybrid derivatives' escaping the homogenizing effects of gene flow from parental species have been simulated with computers. The model is of recombinational speciation. Chromosomal rearrangements between parental species result in poor fertility of F(sub.1) hybrids. Through recombination novel homozygous types are formed and fertility is restored

Usage, Environmental aspects, Natural selection, Evolution (Biology), Genetic recombination, Origin of species, Computer simulation, Fertilization (Biology), Isolating mechanisms, Ploidy

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Transgressive segregation, adaptation and speciation

Article Abstract:

The authors examine the frequency and nature of transgressive segregation, its genetic basis and evolutionary role for hybridization. Factors that predict the occurrence of transgression for a given cross, and results showing that hybridization provides material for rapid adaptation, are discussed.

Analysis, Adaptation (Biology), Evolutionary adaptation, Genetics

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