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Related Experiment Video

Updated: May 17, 2026

Manipulation of Ploidy in Caenorhabditis elegans
07:54

Manipulation of Ploidy in Caenorhabditis elegans

Published on: March 15, 2018

Mutational effects depend on ploidy level: all else is not equal.

Aleeza C Gerstein1

  • 1Department of Zoology and Biodiversity Research Center, University of British Columbia, Vancouver, British Columbia, Canada. gerstein@zoology.ubc.ca

Biology Letters
|October 12, 2012
PubMed
Summary
This summary is machine-generated.

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Nondisjunction01:29

Nondisjunction

During meiosis, chromosomes occasionally separate improperly. This occurs due to failure of homologous chromosome separation during meiosis I or failed sister chromatid separation during meiosis II. In some species, notably plants, nondisjunction can result in an organism with an entire additional set of chromosomes, which is called polyploidy. In humans, nondisjunction can occur during male or female gametogenesis and the resulting gametes possess one too many or one too few chromosomes.
Nondisjunction01:29

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During meiosis, chromosomes occasionally separate improperly. This occurs due to failure of homologous chromosome separation during meiosis I or failed sister chromatid separation during meiosis II. In some species, notably plants, nondisjunction can result in an organism with an entire additional set of chromosomes, which is called polyploidy. In humans, nondisjunction can occur during male or female gametogenesis and the resulting gametes possess one too many or one too few chromosomes.
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Meiosis vs. Mitosis

Cell division is necessary for growth and reproduction in organisms. Mitosis aids cell growth and development by dividing somatic cells. In contrast, meiosis causes the division of germ cells and plays an essential role in sexual reproduction. Due to their unique functional requirements, mitosis and meiosis differ from each other in multiple aspects.
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The impact of genetic mutations on adaptation differs significantly between haploid and diploid cells. This study reveals that the same adaptive mutations have a greater effect in haploid yeast than in homozygous diploid yeast.

Area of Science:

  • Evolutionary biology
  • Genetics
  • Yeast research

Background:

  • Ploidy is known to influence adaptation, but the behavior of individual mutations across different ploidy levels is understudied.
  • Theoretical models often assume selective parameters are consistent across ploidy, excluding dominance effects.

Purpose of the Study:

  • To investigate whether single adaptive mutations exhibit consistent effect sizes in different ploidy backgrounds.
  • To empirically test the assumption that mutation effects are ploidy-independent.

Main Methods:

  • Utilized the budding yeast Saccharomyces cerevisiae as a model organism.
  • Compared the effect size of 20 adaptive mutations in haploid and homozygous diploid cells.

Main Results:

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Related Experiment Videos

Last Updated: May 17, 2026

Manipulation of Ploidy in Caenorhabditis elegans
07:54

Manipulation of Ploidy in Caenorhabditis elegans

Published on: March 15, 2018

Establishment of Proliferative Tetraploid Cells from Nontransformed Human Fibroblasts
10:04

Establishment of Proliferative Tetraploid Cells from Nontransformed Human Fibroblasts

Published on: January 8, 2017

Ploidy Manipulation of Zebrafish Embryos with Heat Shock 2 Treatment
11:19

Ploidy Manipulation of Zebrafish Embryos with Heat Shock 2 Treatment

Published on: December 16, 2016

  • Found that the same adaptive mutations frequently had a larger effect size in haploid cells compared to homozygous diploid cells.
  • Demonstrated significant variation in mutation effect size based on ploidy.

Conclusions:

  • The assumption that mutation effects are uniform across different ploidy levels is not empirically supported.
  • Ploidy significantly modulates the effect size of adaptive mutations, impacting evolutionary trajectories.