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Sex-linked Disorders

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 Chromosomes

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...

X-Inactivation

X-Inactivation

The human X chromosome contains over ten times the number of genes as in the Y chromosome. Since males have only one X chromosome, and females have two, one might expect females to produce twice as many of the proteins, with undesirable results.

X-inactivation

X-inactivation

The human X chromosome contains over ten times the number of genes as in the Y chromosome. Since males have only one X chromosome, and females have two, one might expect females to produce twice as many of the proteins, with undesirable results.

X-linked Traits

X-linked Traits

In most mammalian species, females have two X sex chromosomes and males have an X and Y. As a result, mutations on the X chromosome in females may be masked by the presence of a normal allele on the second X. In contrast, a mutation on the X chromosome in males more often causes observable biological defects, as there is no normal X to compensate. Trait variations arising from mutations on the X chromosome are called “X-linked”.

X-linked Traits

X-linked Traits

In most mammalian species, females have two X sex chromosomes and males have an X and Y. As a result, mutations on the X chromosome in females may be masked by the presence of a normal allele on the second X. In contrast, a mutation on the X chromosome in males more often causes observable biological defects, as there is no normal X to compensate. Trait variations arising from mutations on the X chromosome are called “X-linked”.

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Related Experiment Video

Updated: Jun 27, 2026

Exploring X Chromosomal Aberrations in Ovarian Cells by Using Fluorescence In Situ Hybridization

Exploring X Chromosomal Aberrations in Ovarian Cells by Using Fluorescence In Situ Hybridization

Published on: April 7, 2023

[Amenorrhea and X chromosome abnormalities].

Rafael Fabiano Machado Rosa¹, Raquel Papandreus Dibi, Jamile dos Santos Picetti

¹Complexo Hospitalar Santa Casa de Porto Alegre, Universidade Federal de Ciências da Saúde de Porto Alegre, Porto Alegre, RS, Brasil.

Revista Brasileira De Ginecologia E Obstetricia : Revista Da Federacao Brasileira Das Sociedades De Ginecologia E Obstetricia

|December 17, 2008

Summary

Cytogenetic analysis is crucial for diagnosing ovarian failure in women with amenorrhea and X chromosome abnormalities. This testing can confirm diagnoses and identify risks, even without physical signs.

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Published on: September 16, 2019

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Last Updated: Jun 27, 2026

Exploring X Chromosomal Aberrations in Ovarian Cells by Using Fluorescence In Situ Hybridization

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Published on: April 7, 2023

Analysis of Chromosome Segregation, Histone Acetylation, and Spindle Morphology in Horse Oocytes

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A Robust Polymerase Chain Reaction-based Assay for Quantifying Cytosine-guanine-guanine Trinucleotide Repeats in Fragile X Mental Retardation-1 Gene

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Published on: September 16, 2019

Area of Science:

Genetics
Reproductive Endocrinology
Clinical Cytogenetics

Context:

Amenorrhea, or the absence of menstruation, can stem from various causes, including chromosomal abnormalities.
X chromosome abnormalities are a known factor contributing to reproductive health issues, including ovarian dysfunction.

Purpose:

To correlate clinical presentations of amenorrhea with specific X chromosome abnormalities.
To evaluate the diagnostic utility of cytogenetic analysis in women with ovarian failure of unknown etiology.

Summary:

Retrospective analysis of 141 amenorrheic patients revealed X chromosome abnormalities in 29% (16% numerical, 13% structural).
Primary amenorrhea was strongly associated with Turner syndrome (91.7%), often involving Xp alterations, while secondary amenorrhea cases showed a 54.5% Turner phenotype (X monosomy).
Isolated ovarian failure cases were linked to Xq deletions and X trisomy, highlighting the spectrum of X chromosome involvement.

Impact:

Cytogenetic analysis is essential for diagnosing ovarian failure, even in the absence of dysmorphic features.
Genetic testing aids in confirming diagnoses and identifying at-risk individuals, such as those with 46,XY cell lines, in syndromic patients.