(A) Turner's syndrome is caused by the absence of one $X$ chromosome in females,resulting in a genotype of $45, XO$. This condition is characterized b

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(A) Turner's syndrome is caused by the absence of one $X$ chromosome in females,resulting in a genotype of $45, XO$. This condition is characterized by a $2n-1$ chromosomal arrangement,which is a form of monosomy. Since it involves the loss of an $X$ chromosome,it is specific to females.