The number of $Barr$ bodies in $XXXXY$ is .....

In humans,which disorder is caused due to the absence of one of the $X$ chromosomes,i.e.,$45$ with $XO$?

In humans,mental retardation is associated with sex-linked abnormalities. It is generally due to:

The cause of Turner's syndrome in humans is:

An abnormal human male phenotype involving an extra $X$ chromosome $(XXY)$ is a case of

$A$ pregnant woman who has undergone an amniocentesis test finds an extra $Barr$ body in her embryo. Which syndrome is likely to be associated with the embryo?