Question

How many barr bodies present in turner syndrome justyfy?

Answer 1

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$\pink{Barr \: Bodies : }$
❇One of the Two X-Chromosomes in the female becomes inactive by undergoing heterochromatisation during early embryogenesis.

❇This heterochromatinised X-Chromosomes are called Barr bodies.

❇It occurs in the females as there are two copies of X-Chromosomes for achievement of dosage compensation.

❇ This phenomenon was first described by Murray L. Barr

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➡No Barr Bodies are found in the somatic cells of Turner's female.

✔ Turner's syndrome is due to monosomy of 23rd pair of chromosomes ,where one X-Chromosome is lost.

✔The karyotype is 45,X

✔✔Since, there is only one X-Chromosome , there's no need for heterochromatisation of X-Chromosome...

Therefore, there is no Barr Bodies in Turner syndrome.


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