What is a sex linked disorder

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Sex linkage

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Sex-linked recessive: MedlinePlus Medical Encyclopedia

Sex linked is a trait in which a gene is located on a sex chromosome. In humans, the term generally refers to traits that are influenced by genes on the X chromosome. This is because the X chromosome is large and contains many more genes than the smaller Y chromosome. In a sex-linked disease, it is usually males who are affected because they have a single copy of X chromosome that carries the mutation.
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Sex-Linked Genetic Disorders and Chromosome Theory Exceptions, Epigenetic Factors

License: CC BY 2. License: CC BY 3. Also known as the Boveri—Sutton chromosome theory , the chromosome theory of inheritance states that chromosomes are the basis of all genetic inheritance.
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Sex linkage describes the sex-specific patterns of inheritance and presentation when a gene mutation allele is present on a sex chromosome allosome rather than a non-sex chromosome autosome. In humans, these are termed X-linked recessive , X-linked dominant and Y-linked. The inheritance and presentation of all three differ depending on the sex of both the parent and the child. This makes them characteristically different from autosomal dominance and recessiveness.
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