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  4. 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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Q. 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.

Principles of Inheritance and Variation

Solution:

Turner's syndrome occurs 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.