Hybrid populations such as those seen between towhee species complicate the biological species concept because: hybrid individuals result from mating between two different species of towhee, but they are sterile. stable hybrid populations are formed when two different towhee species mate. hybrid populations are in the process of forming a new species. Ohybrid populations are unable to breed with either parent species.
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.
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