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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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A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material...
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Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
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Human genetics provides a profound framework for understanding the interplay between genetic predispositions and human psychology. At the heart of this discipline lies the study of how genes influence physical traits, behaviors, and susceptibility to diseases. Each person carries a unique genetic code that subtly or significantly shapes their psychological and behavioral landscape.
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Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
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Related Experiment Video

Updated: Jan 26, 2026

Mutagenesis and Analysis of Genetic Mutations in the GC-rich KISS1 Receptor Sequence Identified in Humans with Reproductive Disorders
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Measuring intolerance to mutation in human genetics.

Zachary L Fuller1, Jeremy J Berg2, Hakhamanesh Mostafavi2

  • 1Department of Biological Sciences, Columbia University, New York, NY, USA. zlf2101@columbia.edu.

Nature Genetics
|April 10, 2019
PubMed
Summary
This summary is machine-generated.

Identifying genes intolerant to mutation is crucial for understanding genetic disease. The probability of being loss-of-function intolerant (pLI) metric, while useful, actually measures selection on heterozygotes, not haploinsufficiency or dominance.

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Area of Science:

  • Genetics
  • Population Genetics
  • Genomic Medicine

Background:

  • Assessing the impact of genetic mutations, particularly protein-truncating variants (PTVs), is vital for applications ranging from animal models to human disease susceptibility.
  • Several metrics have been developed to identify genes with low frequencies of PTVs, indicating a potential intolerance to such mutations.

Purpose of the Study:

  • To clarify the biological basis of metrics used to identify mutation-intolerant genes, specifically the probability of being loss-of-function intolerant (pLI).
  • To distinguish between selection acting on heterozygotes and concepts of genetic dominance or haploinsufficiency.

Main Methods:

  • Analysis of population genetic data to compare observed versus expected numbers of PTVs in large population samples.
  • Evaluation of the interpretation of gene intolerance metrics derived from population data.

Main Results:

  • The widely adopted pLI metric is designed to classify genes based on PTV counts, categorizing them as null, recessive, or haploinsufficient.
  • Population-genetic approaches, including pLI, primarily reflect the strength of natural selection acting on heterozygous individuals.

Conclusions:

  • Metrics like pLI, while valuable for identifying genes with low mutation tolerance, do not directly measure dominance or haploinsufficiency.
  • These population-genetic measures are more accurately interpreted as indicators of selection pressure on heterozygotes.