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Turners syndrome is a
result of which of the
following nondisjunction
mutations?
A. only an X chromosome this is answer
B. three copies of the 21st chromosome
C. two X chromosomes and a Y
D. deletion of chromosome 5

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Answer:-

  • Only a X chromosome.

[tex]\Large{\underline{\sf Turner's \ Syndrome }}[/tex]

  • This disorder is caused due to the fusion if an normal sperm with an abnormal egg or of a abnormal sperm with a normal egg, both of which results in 22 + X0 condition.
  • The females have rudimentary ovaries and hence are sterile and also lack secondary sexual characters.

Some other chromosomal disorders are:-

  • Down's syndrome - Caused due to trisomy of 21st chromosome .

  • Klinefelter's syndrome - Due to presence of additional copy of a X chromosome.

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