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Related Concept Videos

Mutation, Gene Flow, and Genetic Drift01:09

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).
What is Population Genetics?01:25

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.
Genetic Drift03:33

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.
Gene Flow02:39

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 Variation01:25

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...
Principles of Pharmacogenetics: Types of Genetic Variants01:27

Principles of Pharmacogenetics: Types of Genetic Variants

The human genome is over 99.9% identical between individuals, yet genetic differences exist at millions of bases. The human genome contains approximately 3 million variant positions per individual, many of which are heterozygous, contributing to genetic diversity and individual traits. Genetic variations include single-nucleotide polymorphisms (SNPs), insertions, deletions, and copy number variations (CNVs).SNPs, the most common variation, involve single-base changes in DNA. These can be...

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Related Experiment Video

Updated: May 21, 2026

Following the Dynamics of Structural Variants in Experimentally Evolved Populations
04:52

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Published on: February 3, 2023

Adaptive genetic variation and population differences.

Chao-Qiang Lai1

  • 1Nutrition and Genomics Laboratory, Jean Meyer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, Massachusetts, USA.

Progress in Molecular Biology and Translational Science
|June 5, 2012
PubMed
Summary
This summary is machine-generated.

Human genome evolution is driven by adaptation to diverse environments, influencing disease susceptibility. Understanding genetic variations and environmental interactions is key for personalized nutrition and disease prevention strategies.

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Area of Science:

  • Human evolutionary genetics
  • Nutrigenomics
  • Environmental health

Background:

  • Human genome shaped by migration, adaptation to local environments (climate, diet, pathogens).
  • Genetic variations interact with environmental factors (diet, lifestyle), affecting nutrient metabolism and disease risk.
  • Disparities in disease susceptibility exist across and within populations due to these interactions.

Purpose of the Study:

  • Examine methodologies for studying adaptive genetic variation.
  • Establish the significance of adaptive genetic variation for human health.
  • Discuss implications for nutrigenomics and disease prevention.

Main Methods:

  • Review of methodologies for analyzing adaptive genetic variation across human populations.
  • Integration of population genetics, environmental data, and health outcomes.
  • Comparative analysis of genetic and environmental influences on disease risk.

Main Results:

  • Adaptive genetic variations significantly influence human health and disease susceptibility.
  • Environmental factors interact dynamically with genetic predispositions.
  • Identified specific genetic adaptations linked to regional environmental pressures.

Conclusions:

  • Understanding adaptive genetic variation is crucial for personalized health strategies.
  • Implications for developing targeted nutrigenomics research and dietary recommendations.
  • Highlights the need for a holistic approach to disease prevention considering genetic and environmental interplay.