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Related Concept Videos

Mutation, Gene Flow, and Genetic Drift01:09

Mutation, Gene Flow, and Genetic Drift

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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).
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Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.
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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.
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Biodiversity describes the variety of living things at multiple organizational levels: genetic, species and ecosystem diversity. Species diversity includes all branches of the evolutionary tree from single-celled prokaryotic organisms, bacteria, and archaea, to the eukaryotic kingdoms: plants; animals; fungi; and protists. To date, there have been about 1.75 million species identified, and new species are discovered every week.
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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.
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Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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Evolution, genetic diversity, and health.

María J Palma-Martínez1, Yuridia S Posadas-García1, Amara Shaukat1

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Summary

Understanding human genetic diversity is key for precision medicine. Integrating ancestral and environmental factors into clinical genomics is crucial for equitable healthcare and disease research.

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Area of Science:

  • Genomics
  • Evolutionary Biology
  • Precision Medicine

Background:

  • Human genetic diversity arises from evolutionary history, demographics, and environmental factors.
  • This diversity impacts complex traits, disease susceptibility, and drug responses.
  • Current initiatives like the human Pangenome and biobanks aim to capture diversity but face challenges.

Purpose of the Study:

  • To discuss the importance of diversity in clinical genomics from an evolutionary perspective.
  • To highlight progress and challenges in representing human genetic diversity.
  • To outline clinical applications of diverse genetic data.

Main Methods:

  • Review and synthesis of current research on human genetic diversity.
  • Evolutionary lens applied to clinical genomics.
  • Discussion of data and methodological diversification.

Main Results:

  • Progress has been made in capturing human diversity through large-scale initiatives.
  • Significant challenges remain in achieving equitable representation.
  • Diverse genetic data has key clinical applications.

Conclusions:

  • Diversifying datasets and methodologies, including ancestral and environmental factors, is essential.
  • This integration is crucial for a comprehensive understanding of the genetic basis of health and disease.
  • Achieving diversity in genomics promotes equitable healthcare and advances precision medicine.