How can a geneticist find and map quantitative trait loci (QTLs)? By dividing the covariance by the product of the standard deviations of traits x and y By determining whether different genotypes for a known DNA marker also show variation in a quantitative characteristic O By determining the selection response "R" and the selection differential "s" By calculating the genetic variance for a quantitative from the phenotypic and environmental variance

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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.