X-linked

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Term Definition
X-linked

X-linked diseases are single gene disorders that reflect the presence of defective genes on the X chromosome. This chromosome is present as two copies in females but only as one copy in males.

The inheritance patterns of X-linked diseases in family pedigrees are complicated by the fact that males always pass their X chromosome to their daughters but never to their sons, whereas females pass their X chromosomes to daughters and sons with equal.

Like autosomal single gene disorders, X-linked diseases can be either recessive or dominant.

Definition from The Human Genome - Wellcome Trust: X-linked

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