If you look carefully at your family tree, you may notice that certain diseases and conditions seem to follow a gender-specific pattern. There are a number of diseases that are sex-linked, which means these conditions mainly affect family members of one gender and are passed from parent to child. Sex-linked conditions and diseases are those that are carried by the X and Y chromosomes, the part of your genome that determines whether you're a male or a female. Males receive an X chromosome from their mother and a Y chromosome from their fathers. Females receive an X chromosome from each parent. LiveScience reports that the X chromosome is much larger than the Y chromosome and, in addition to its role in sex determination, carries 1, genes responsible for many different characteristics.
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Sex-Linked Traits and Disorders
Sex-linked diseases are passed down through families through one of the X or Y chromosomes. X and Y are sex chromosomes. Dominant inheritance occurs when an abnormal gene from one parent causes disease, even though the matching gene from the other parent is normal. The abnormal gene dominates. But in recessive inheritance, both matching genes must be abnormal to cause disease. If only one gene in the pair is abnormal, the disease does not occur or it is mild.
Triple X syndrome
A sex chromosome , also referred to as an allosome , heterotypical chromosome , or heterochromosome ,   or idiochromosome  is a chromosome that differs from an ordinary autosome in form, size, and behavior. The human sex chromosomes, a typical pair of mammal allosomes, determine the sex of an individual created in sexual reproduction. Autosomes differ from allosomes because autosomes appear in pairs whose members have the same form but differ from other pairs in a diploid cell , whereas members of an allosome pair may differ from one another and thereby determine sex. Nettie Stevens and Edmund Beecher Wilson both independently discovered sex chromosomes in
Disorders of the sex chromosome like disorders of the autosomes can be either numerical or structural, and can be present in all cells or in a mosaic form. Clinical indications that should raise suspicions of a sex chromosome abnormality are:. These disorders are considered very common with incidence of about — Phenotypes associated with sex chromosome disorders are less severe than autosomal defects and this is mainly due to X chromosome inactivation , as well as the fact that Y chromosomes have a low gene content.