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Related Concept Videos

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...
The Y Chromosome Determines Maleness02:19

The Y Chromosome Determines Maleness

The Y chromosome is a sex chromosome found in several vertebrates and mammals, including humans. In addition to 22 pairs of autosomes, the human males have one X chromosome and one Y chromosome. In these organisms, the presence or absence of the Y chromosome determines the development of male traits.
Evolution
Around 300 million years ago, the two sex chromosomes diverged from two identical autosomal chromosomes. Over time, the Y chromosome has lost most of its genes, shrinking in size. Today,...
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.
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.
X and Y Chromosomes02:32

X and Y Chromosomes

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.
The germline cells such as egg and sperm cells carry only half the number of chromosomes, i.e., 22 autosomes and one sex chromosome. All eggs have an X chromosome, while sperm cells can carry an X or...
Dosage Compensation02:50

Dosage Compensation

In animals, gender is determined by the number and type of sex chromosome. For example, human females have two X chromosomes, and males have one X and one Y chromosome, whereas C.elegans with one X chromosome is a male, and the one with two X chromosomes is a hermaphrodite.
In addition to sexual development, the X chromosome has genes involved in autosomal functions such as brain development and the immune system. Therefore, males and females with  distinct numbers of X chromosomes will have...

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Related Experiment Video

Updated: May 15, 2026

Skeletal Muscle Gender Dimorphism from Proteomics
09:29

Skeletal Muscle Gender Dimorphism from Proteomics

Published on: December 14, 2011

Molecular sex differences in human serum.

Jordan M Ramsey1, Emanuel Schwarz, Paul C Guest

  • 1Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, United Kingdom.

Plos One
|December 20, 2012
PubMed
Summary

This study identified 77 reproducible sex-specific differences in serum molecules in typical individuals. These molecular sex differences, particularly in fatty acid oxidation and immune function, were altered in individuals with Asperger syndrome.

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Isolation of Small Noncoding RNAs from Human Serum
06:44

Isolation of Small Noncoding RNAs from Human Serum

Published on: June 19, 2014

Area of Science:

  • Biochemistry
  • Immunology
  • Genetics

Background:

  • Sex significantly influences disease prevalence, progression, and treatment response.
  • Understanding molecular sex differences is crucial for studying sex-specific health conditions.

Purpose of the Study:

  • To identify and characterize molecular differences in serum between typical males and females.
  • To investigate the association of these sex-specific molecular differences with Asperger syndrome.

Main Methods:

  • Analyzed 174 serum molecules in 9 independent cohorts (196 males, 196 females) using multiplexed immunoassays.
  • Quantified sex differences via meta-analysis and clustered analytes by biological function using k-means.
  • Applied findings to a cohort of individuals with Asperger syndrome.

Main Results:

  • Identified 77 reproducible sex differences in serum analyte levels across cohorts.
  • Females showed higher levels of analytes related to fatty acid oxidation, hormone regulation, immune cell growth, and cell death.
  • Males exhibited higher levels of analytes involved in immune cell chemotaxis.

Conclusions:

  • Sex-specific molecular differences in metabolism and immune function are reproducible in typical individuals.
  • Deviations in a specific molecular cluster were observed in individuals with Asperger syndrome.
  • Highlights the importance of considering sex as a biological variable in medical research.