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Related Concept Videos

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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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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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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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What is Meiosis?01:34

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Meiosis is the process by which diploid cells divide to produce haploid daughter cells. In humans, each diploid cell contains 46 chromosomes, half from the mother and half from the father. Following meiosis, the resulting haploid eggs or sperm only contain 23 chromosomes; however, each of these chromosomes contains a unique combination of parental information that results from the meiotic process of crossing over.
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X and Y Chromosomes02:32

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Among mammals, the gender of an organism is determined by the sex chromosomes. Humans have two sex chromosomes, X and Y. Every human diploid cell has 22 pairs of autosomes and one pair of sex chromosomes. A human female has two X chromosomes, while a male has one X chromosome and one Y chromosome.
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Updated: Jul 25, 2025

Exploring X Chromosomal Aberrations in Ovarian Cells by Using Fluorescence In Situ Hybridization
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Sperm and Oocyte Chromosomal Abnormalities.

Osamu Samura1, Yoshiharu Nakaoka2, Norio Miharu3

  • 1Department of Obstetrics and Gynecology, The Jikei University School of Medicine, Tokyo 105-8461, Japan.

Biomolecules
|June 28, 2023
PubMed
Summary
This summary is machine-generated.

Chromosomal abnormalities in eggs (oocytes) cause miscarriages, while sperm defects lead to birth anomalies. Gamete chromosome analysis is vital for assisted reproductive technology success.

Keywords:
aneuploidygametogenesismeiosisoocytesperm chromosome

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Area of Science:

  • Reproductive biology
  • Human genetics
  • Cytogenetics

Background:

  • Oocytes and sperm exhibit distinct gametogenesis processes with differing chromosomal error origins.
  • Increasing female age correlates with a higher incidence of oocyte chromosomal aberrations.
  • Sperm chromosome analysis presents unique challenges compared to somatic cells.

Purpose of the Study:

  • To review clinical trials on oocyte and sperm chromosome analyses.
  • To highlight the importance of gamete chromosome examination in assisted reproductive technology (ART).
  • To address the clinical utility and interpretation of sperm chromosome analysis.

Main Methods:

  • Review of reported clinical trials focusing on oocyte and sperm chromosome analyses.
  • Discussion of specialized techniques for sperm chromosome evaluation, including fluorescence in situ hybridization (FISH) and interspecies oocyte fusion (e.g., hamster eggs).

Main Results:

  • Oocytes are the primary source of aneuploidies, contributing to miscarriages and infant chromosomal disorders.
  • Sperm are the main source of structural chromosomal anomalies.
  • Assisted reproductive technologies enable men with fertility issues to father children but can increase miscarriage and embryonic chromosomal abnormality rates.

Conclusions:

  • Understanding gametic chromosomal abnormalities is crucial for improving ART outcomes.
  • Further research into the mechanisms of gametic chromosomal abnormalities is necessary.
  • Clinical guidelines for sperm chromosome analysis and result interpretation are needed.