Category: Lab Notes

Phenotypic variance describes differences in observable traits among individuals. Learn how genetic variance, environmental variance, additive effects, dominance, epistasis, heritability, and G×E contribute to phenotypic variation.

Epistatic variance is the component of genetic variance caused by interactions between different genetic loci. Learn how epistasis influences complex traits, genetic architecture, heritability, breeding, natural selection, and evolution.

Dominance variance is the component of genetic variance caused by interactions between alleles at the same locus. Learn how it affects phenotypic variation, heritability, breeding, heterosis, inbreeding, and evolution.

Additive genetic variation is the heritable component of genetic variation that contributes predictably to differences among individuals and determines much of the response to natural and artificial selection.

Environmental variation refers to differences in phenotypes caused by differences in environmental conditions. Learn how nutrition, temperature, climate, development, and other factors influence traits and interact with genetic variation.

Phenotypic variation describes differences in observable traits among individuals. Learn how genes, environment, polygenic inheritance, heritability, and genotype–environment interactions shape phenotypic variation.

Continuous variation occurs when a trait shows a continuous range of phenotypic values. Learn how polygenic inheritance, genetic variation, environment, heritability, and quantitative genetics shape these traits.

Polygenic inheritance occurs when multiple genes collectively influence a trait. Learn how polygenes, genetic architecture, heritability, environment, QTL, GWAS, and selection shape complex traits.

Qualitative and quantitative traits differ in their inheritance patterns, genetic complexity, and environmental influences. Learn about Mendelian traits, polygenic inheritance, heritability, genetic architecture, QTL, and complex traits.

Quantitative genetics explains how genetic and environmental factors influence complex traits. Explore heritability, breeding values, genetic variance, selection, QTL, GWAS, genomic selection, and genetic architecture.

Population genomics uses genome-wide data to investigate genetic variation within and among populations. Learn how SNPs, whole-genome sequencing, and genomic analysis reveal population structure, gene flow, selection, adaptation, and demographic history.

Genetic differentiation among breeds results from artificial selection, genetic drift, founder effects, gene flow, effective population size, and different breeding histories. Learn how these processes shape breed-specific genetic variation.

Migration and genetic exchange connect populations through the movement of individuals and alleles. Learn how gene flow influences genetic diversity, allele frequencies, population structure, differentiation, adaptation, and evolution.

Population expansion and contraction change the genetic structure of populations over time. Learn how demographic changes influence genetic drift, effective population size, bottlenecks, gene flow, and genetic diversity.

Closed populations receive little or no genetic input from outside populations. Learn how genetic drift, mutation, inbreeding, effective population size, and restricted gene flow influence their genetic diversity.