Question

Assertion [A]: Turner syndrome occurs only in females.

Reason [R]: Turner syndrome is characterised by only one X chromosome.

• A. Assertion [A] is true and Reason [R] is false
• B. Reason [R] is true and Assertion [A] is false
• C. Both [A] and [R] are true and [R] is the correct explanation for [A]
• D. Both [A] and [R] are true but [R] is not the correct explanation for [A]

Answer 1

The correct option is C Both [A] and [R] are true and [R] is the correct explanation for [A]

Turner syndrome arises due to abnormalities in sex chromosomes. The factors leading to Turner's syndrome are:

• Inheritance of only one X chromosome from parents.
• Inactivation of gender-related part of X-chromosome.

Instead of the normal 44+XX chromosomal condition, women suffering from Turner syndrome show 44+XO condition. They are sterile, i.e., they are unable to have children due to improper growth of the reproductive organs.