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Assertion : Turner's syndrome is caused ...

Assertion : Turner's syndrome is caused due to absence of any one of the X and Y sex chromosome
Reason : Such individuals show masculine as well as feminine development.

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Turner's syndrome occur due absence of X chromosome. Individuals having a single X chromosome `2A+XO(45)` have female sexual differentiation but ovaries are rudimentary. Other associated phenotypes of this condition are short stature, webbed-neck, broad chest lack of secondary sexual characteristics and sterility. Thus, any imbalance in the copies of the sex chromosomes may disrupt the genetic information necessary for normal sexual development.
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