Genetic Variation
Genetic variation refers to the variation in the genome sequences between individual organisms of a species. Individual differences or population differences can both be referred to as genetic variations. It is primarily caused by mutation, but other factors such as genetic drift and sexual reproduction also play a major role.
Quantitative Genetics
Quantitative genetics is the part of genetics that deals with the continuous trait, where the expression of various genes influences the phenotypes. Thus genes are expressed together to produce a trait with continuous variability. This is unlike the classical traits or qualitative traits, where each trait is controlled by the expression of a single or very few genes to produce a discontinuous variation.
What are factors which causes two hybrid populations to separate?
- Reinforcement
- Fusion
- Stability
Hybridization has the potential to influence evolution in a number of ways. The geographical spread of ecologically different populations may be limited if hybrids are less fit, and prezygotic reproductive isolation may be encouraged. Hybridization could be beneficial if some hybrid genotypes are more fit than one or both parents, at least in some situations. Divergent evolution is described as the accumulation of differences between sister species (or closely related species) populations that results in speciation. It usually happens when members of two populations are separated by a geographic barrier. Two populations may mix forever after speciation, resulting in ongoing divergence.
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