The cause of Turner's syndrome in humans is:

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(D) Turner's syndrome is a genetic disorder caused by the absence of one $X$ chromosome in human females. The genotype of an individual with Turner's

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Sex-chromosomal abnormality

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(D) Turner's syndrome is a genetic disorder caused by the absence of one $X$ chromosome in human females. The genotype of an individual with Turner's syndrome is $45, XO$ (or $44 + XO$). This condition is classified as a sex-chromosomal abnormality because it involves the loss of an entire sex chromosome,leading to a total of $45$ chromosomes instead of the normal $46$.

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