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Question

Which among the following factors cause Turner's syndrome?

A
Inheritance of one extra X chromosome.
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B
Inactivation of gender related part of X-chromosome.
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C
Inheritance of only one X chromosome.
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D
(b) and (c) above.
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Solution

The correct option is D (b) and (c) above.
Turner's 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's syndrome show 44+XO condition. They are sterile, i.e., they are unable to have children due to improper growth of their reproductive organs.

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