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X-linked recessive

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Term Definition
X-linked recessive

Used to describe a characteristic or condition in which a mutation in a gene on the X chromosome causes the condition in males.

Males have only one X chromosome, the other sex chromosome being a Y chromosome. A female has two X chromosomes. If she has one copy of the usual gene and one copy of the altered gene she is a carrier. Females who have only one copy of the altered gene most commonly do not show signs of the condition, but occasionally may, because of differences in X-chromosome inactivation.

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