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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-The effect of genetic drift only shows up in populations with few individuals. Large populations are not subjected to genetic drift.
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-If the genetic drift is the only evolutionary force influencing a population, then given long enough time, the heterozygosity in the population will always decrease to zero.
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-Usually, the A allele in the population will be fixed by genetic drift, if A is dominant over a.
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-The effect of genetic drift will be more prominent if the allele has a strong deleterious effect on the fitness of the individual carrying the allele.
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-None of the above
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