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

In which disorder is the $XXY$ karyotype present?

Down's syndrome is an example of

If a female individual has a small round head,furrowed tongue,partially open mouth,and a broad palm with a characteristic palm crease,and also exhibits retarded physical,psychomotor,and mental development,the karyotype analysis of such an individual will show:

In which of the following disorders does an affected individual possess $47$ chromosomes?

Which one of the following is a chromosomal disorder?