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Related Concept Videos

Sex-linked Disorders01:43

Sex-linked Disorders

Like autosomes, sex chromosomes contain a variety of genes necessary for normal body function. When a mutation in one of these genes results in biological deficits, the disorder is considered sex-linked.
The Ratio of X Chromosome to Autosomes02:45

The Ratio of X Chromosome to Autosomes

In most organisms, sex is determined by the ratio of X and Y chromosomes. However, in some organisms, such as Drosophila and C.elegans, sex is determined by the ratio of the number of X chromosomes to the number of sets of autosomes. The Y chromosome in Drosophila is active but does not determine sex. It contains genes responsible for the production of sperms in adult flies.  
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female Drosophila...
Sex Linked Disorders01:43

Sex Linked Disorders

Like autosomes, sex chromosomes contain a variety of genes necessary for normal body function. When a mutation in one of these genes results in biological deficits, the disorder is considered sex-linked.
Meiosis vs. Mitosis02:57

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.
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...

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Related Experiment Video

Updated: Jul 25, 2026

Sex Stratified Neuronal Cultures to Study Ischemic Cell Death Pathways
10:44

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Published on: December 9, 2013

[Sex differences in sudden infant death].

M Srch1

  • 1Katedra soudního lékarství LF UK, Hradec Králové.

Soudni Lekarstvi
|March 1, 1992
PubMed
Summary

Sudden infant deaths show a higher proportion of boys compared to disease-related infant deaths. This suggests sudden infant death syndrome may biologically balance the higher birth rate of males.

Area of Science:

  • Pediatrics
  • Demography
  • Epidemiology

Context:

  • Sudden infant death syndrome (SIDS) is a leading cause of post-neonatal mortality.
  • Male infants exhibit a higher incidence of SIDS compared to female infants.
  • Understanding SIDS's demographic patterns is crucial for public health initiatives.

Purpose:

  • To investigate the sex distribution in sudden infant deaths.
  • To compare the sex ratio of SIDS cases with infants deceased from other causes.
  • To explore potential biological mechanisms underlying SIDS sex disparity.

Summary:

  • A study of 79 sudden infant deaths revealed 65.8% were boys and 34.2% girls.
  • In a control group of 56 infants dying from disease/injuries, 53.6% were boys and 46.4% girls.

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Last Updated: Jul 25, 2026

Sex Stratified Neuronal Cultures to Study Ischemic Cell Death Pathways
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Sex Stratified Neuronal Cultures to Study Ischemic Cell Death Pathways

Published on: December 9, 2013

Sex Differences in Mouse Hippocampal Astrocytes after In-Vitro Ischemia
08:32

Sex Differences in Mouse Hippocampal Astrocytes after In-Vitro Ischemia

Published on: October 25, 2016

Hypoxia Alters miRNAs Levels Involved in Non-Mendelian Inheritance of Autism Spectrum Disorder in Mice
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Hypoxia Alters miRNAs Levels Involved in Non-Mendelian Inheritance of Autism Spectrum Disorder in Mice

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  • The findings suggest SIDS might be a biological factor counterbalancing the male birth predominance.

    • Impact:

    • Provides insights into the etiology of sudden infant death syndrome.
    • Highlights potential sex-based biological differences in infant mortality.
    • Informs future research on SIDS prevention and risk factors.