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Related Concept Videos

Nondisjunction01:29

Nondisjunction

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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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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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Meiosis vs. Mitosis02:57

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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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Updated: Apr 16, 2026

Exploring X Chromosomal Aberrations in Ovarian Cells by Using Fluorescence In Situ Hybridization
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Structural chromosomal abnormalities in couples with recurrent abortion in Egypt.

Nagwa E A Gaboon, Ahmed Ramy Mohamed, Solaf M Elsayed

    Turkish Journal of Medical Sciences
    |March 21, 2015
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    Summary

    Recurrent pregnancy loss in couples can be linked to chromosomal abnormalities like translocations. Genetic analysis is recommended for couples with two or more unexplained pregnancy losses.

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    Area of Science:

    • Reproductive genetics
    • Human genetics
    • Cytogenetics

    Background:

    • Recurrent pregnancy loss (RPL) affects couples' reproductive health.
    • Identifying underlying causes of RPL is crucial for effective management.

    Purpose of the Study:

    • To determine the frequency of chromosomal abnormalities in couples with RPL.
    • To explore predictive factors for RPL, including parental age and semen analysis.

    Main Methods:

    • A cohort of 125 couples with a history of recurrent abortion was analyzed.
    • Comprehensive medical, ancestral, and physical examinations were performed.
    • Cytogenetic analysis, biochemical testing, pelvic ultrasounds, and semen analyses were conducted.

    Main Results:

    • Chromosomal abnormalities, specifically balanced translocations, were found in 6.4% of couples.
    • Reciprocal translocations (5.6%) and Robertsonian translocations (0.8%) were identified.
    • Translocation carriers were younger than 35, often had a history of poor obstetric outcomes or fetal malformations, and normal semen analyses.

    Conclusions:

    • Cytogenetic analysis is recommended for couples experiencing two or more unexplained pregnancy losses.
    • Genetic counseling is essential for parents identified with chromosomal abnormalities.