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.
Small populations are particularly vulnerable to genetic drift, loss of rare alleles, inbreeding, and bottlenecks. Learn how effective population size and gene flow influence their genetic diversity and long-term viability.
Maintaining genetic diversity helps populations retain evolutionary potential and adapt to environmental change. Learn how effective population size, gene flow, breeding management, and population connectivity preserve genetic variation.
Rare alleles are particularly vulnerable to genetic drift and demographic changes. Learn how bottlenecks, founder effects, small effective populations, and limited gene flow can cause rare genetic variants to disappear.
Genetic drift randomly changes allele frequencies and can eliminate genetic variation from populations. Learn how population size, bottlenecks, founder effects, and gene flow influence the loss of genetic diversity.
Sex ratio can strongly influence effective population size. Learn how the numbers of breeding males and females, reproductive success, and mating systems affect genetic diversity and genetic drift.
Unequal reproductive contributions occur when individuals produce different numbers of offspring. Learn how reproductive success, mating success, sex ratio, and family size influence genetic drift and effective population size.
The effective number of breeding animals describes how many individuals effectively contribute genes to future generations. Learn how reproduction, sex ratio, genetic drift, inbreeding, and population management influence this measure.
Effective population size (Ne) describes how a population behaves genetically compared with an idealized population. Learn how reproduction, sex ratio, bottlenecks, drift, and inbreeding influence Ne.
Population structure describes how genetic variation is distributed within and among populations. Learn how gene flow, genetic drift, selection, migration, and isolation shape population structure.
Genetic distance measures the genetic differences between individuals, populations, or species. Learn how genetic markers and evolutionary processes help researchers measure genetic divergence.
Population subdivision occurs when a species is divided into smaller populations that differ genetically or geographically. Discover how gene flow, genetic drift, selection, and isolation shape population structure.
Genetic differentiation occurs when populations of the same species develop differences in their genetic composition. Learn how gene flow, genetic drift, natural selection, and isolation shape these differences.
