Question

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

Answer 1

Answer:-

• Only a X chromosome.

`\Large{\underline{\sf Turner's \ Syndrome }}`

• 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.