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What is Population Genetics?

What is Population Genetics?

A population is composed of members of the same species that simultaneously live and interact in the same area. When individuals in a population breed, they pass down their genes to their offspring. Many of these genes are polymorphic, meaning that they occur in multiple variants. Such variations of a gene are referred to as alleles. The collective set of all the alleles within a population is known as the gene pool.While some alleles of a given gene might be observed commonly, other variants...

Mutation, Gene Flow, and Genetic Drift

Mutation, Gene Flow, and Genetic Drift

In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).Mechanisms of Genetic VariationThe original sources of genetic variation are mutations,...

Hardy-Weinberg Principle

Hardy-Weinberg Principle

Diploid organisms have two alleles of each gene, one from each parent, in their somatic cells. Therefore, each individual contributes two alleles to the gene pool of the population. The gene pool of a population is the sum of every allele of all genes within that population and has some degree of variation. Genetic variation is typically expressed as a relative frequency, which is the percentage of the total population that has a given allele, genotype or phenotype.In the early 20th century,...

Genetic Drift

Genetic Drift

Natural selection—probably the most well-known evolutionary mechanism—increases the prevalence of traits that enhance survival and reproduction. However, evolution does not merely propagate favorable traits, nor does it always benefit populations.Life is not fair. A deer grazing contentedly in a field can have her meal cut tragically short by a bolt of lightning. If the doomed doe is one of only three in the population, 1/3 of the population’s gene pool is lost. Random events like this can...

Gene Flow

Gene Flow

Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.

Genetic Variation

Genetic Variation

Genetic variation is the diversity in DNA sequences found among individuals of the same species. This diversity is crucial for a species' survival because it helps organisms adapt to environmental changes. Genetic variation begins with fertilization, where an egg and sperm cell merge. Each of these cells carries 23 chromosomes, up to 46 in the fertilized egg. Chromosomes are long DNA strands that contain genes, the basic units of heredity.
Genes exist in different versions called alleles, which...

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Related Experiment Video

Updated: Jul 14, 2026

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Published on: February 3, 2023

[Various topics in population genetics].

Jean-Louis Serre¹

¹Université Versailles/Saint-Quentin-en-Yvelines, Département Biologie, Versailles (78), France. jean-louis.serre@cytogene.uvsq.fr

Presse Medicale (Paris, France : 1983)

|June 5, 2007

Summary

Population genetics reveals deleterious mutations in gene pools, often escaping natural selection. While consanguinity can worsen genetic diseases, modern medicine

Area of Science:

Population genetics
Mathematical biology
Human genetics

Context:

Deleterious mutations are present in all populations, maintained by natural selection.
Consanguinity can increase the frequency of genetic recessive diseases, a concern in some European subpopulations.
Medical advancements may inadvertently transmit deleterious mutations.

Purpose:

To explore the role of population genetics in understanding biological and medical phenomena.
To analyze the impact of consanguinity on genetic disease prevalence.
To assess the dysgenic effect of modern medicine on mutation transmission.

Summary:

Population genetics provides tools to understand mutation dynamics and disease inheritance.
Deleterious mutations persist in populations, often shielded from natural selection.

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Following the Dynamics of Structural Variants in Experimentally Evolved Populations

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The study estimates the dysgenic effect of medicine, finding it less significant than often claimed, with specific impacts on X-linked genes like that for Fabry disease.

Impact:

Offers insights into the genetic health of populations.
Informs public health strategies and genetic counseling.
Contributes to the understanding of evolutionary medicine and genetic disease management.