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.
The "balance" theory by Dobzhansky
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-is a theory based on the idea that genetic diversity in a population is maintained by heterozygote superiority. |
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-is a theory that predicts a low level of genetic diversity in a given population. |
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-was proposed in contrast to the so-called "classical" theory which hypothesized that individuals in a given diploid population should mostly be carrying neutral mutations in their genomes. |
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-has been confirmed by numerous modern-day population genetic surveys, demonstrating the important of neutral mutations and genetic drift. |
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-All of the above |
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