Biological sex in humans and other mammals is determined by a pair of sex chromosomes: XY in males and XX in females. X-linked genes are those that are found on the X chromosome. Because X-linked genes are present in different numbers in males (XX) and females (XX), they have distinct inheritance patterns (XY).
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Answer:
Biological sex in humans and other mammals is determined by a pair of sex chromosomes: XY in males and XX in females. X-linked genes are those that are found on the X chromosome. Because X-linked genes are present in different numbers in males (XX) and females (XX), they have distinct inheritance patterns (XY).
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