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Related Concept Videos

Nondisjunction01:21

Nondisjunction

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Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate correctly and move to the opposite poles of the cells. This produces daughter cells with abnormal chromosome numbers.  Nondisjunction is common during anaphase I or anaphase II of meiosis.  Mutations in synaptonemal complex proteins that attach homologous chromosomes increase the chances of nondisjunction in anaphase I of meiosis I. In contrast, mutations in topoisomerases and condensins that hold...
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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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Meiosis I01:49

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Meiosis is a carefully orchestrated set of cell divisions, the goal of which—in humans—is to produce haploid sperm or eggs, each containing half the number of chromosomes present in somatic cells elsewhere in the body. Meiosis I is the first such division, and involves several key steps, among them: condensation of replicated chromosomes in diploid cells; the pairing of homologous chromosomes and their exchange of information; and finally, the separation of homologous chromosomes by...
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In human women, oogenesis produces one mature egg cell or ovum for every precursor cell that enters meiosis. This process differs in two unique ways from the equivalent procedure of spermatogenesis in males. First, meiotic divisions during oogenesis are asymmetric, meaning that a large oocyte (containing most of the cytoplasm) and minor polar body are produced as a result of meiosis I, and again following meiosis II. Since only oocytes will go on to form embryos if fertilized, this unequal...
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Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...
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Genomic Imprinting and Inheritance

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Diploid organisms inherit genetic material through chromosomes from both parents. Copies of the same gene are known as alleles. In most cases, both alleles are simultaneously expressed and allow various cellular processes to function optimally. If one of the alleles is missing or mutated, the expression of the other allele can compensate; however, this is not true for all genes.
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Related Experiment Video

Updated: Oct 7, 2025

Using Mouse Oocytes to Assess Human Gene Function During Meiosis I
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Effects of aneuploidy on cell behaviour and function.

Rong Li1,2,3,4, Jin Zhu5

  • 1Mechanobiology Institute, National University of Singapore, Singapore, Singapore. rong@jhu.edu.

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|January 6, 2022
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Aneuploidy, or abnormal chromosome numbers, impacts development and disease. Recent research reveals its complex cellular effects, which can be beneficial or detrimental depending on the genetic and environmental context.

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Area of Science:

  • Genetics
  • Cell Biology
  • Genomics

Background:

  • Aneuploidy, deviations in chromosome copy number, impacts organisms throughout life.
  • It is a primary cause of human pregnancy loss and a hallmark of cancer.
  • The molecular and cellular effects of aneuploidy have been historically elusive.

Purpose of the Study:

  • To elucidate the multifaceted cellular consequences of aneuploidy.
  • To understand how aneuploidy influences cellular function in various contexts.
  • To explore the implications of aneuploidy in broader biological processes.

Main Methods:

  • Review of recent advances in aneuploidy research.
  • Molecular and cellular level analyses of aneuploid cells.
  • Investigation of context-dependent effects (environmental and karyotypic).

Main Results:

  • Aneuploidy's effects can be beneficial or detrimental, contingent on environmental and karyotype specifics.
  • Aneuploidy induces cellular stress due to genomic and proteomic imbalance.
  • Significant progress has been made in understanding aneuploidy's causes and consequences over the past two decades.

Conclusions:

  • Aneuploidy has diverse impacts on cellular function.
  • Understanding aneuploidy is crucial for fields like genome evolution and human disease.
  • Aneuploidy's role in drug resistance warrants further investigation.