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 two of the same alleles for a trait?
Humans are diploid (2n) organisms that contain two alleles of each gene. The alleles can be dominant or recessive. The dominant allele conceals the effect or expression of the recessive allele. In a diploid genetic constitution, two copies of a recessive allele are required for the expression of the trait encoded by them.
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