Which one of the following is a type of hyperploidy?

$A$ 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?

Loss of a $X$ chromosome in a particular cell during its development results in:

Down's syndrome is caused by the trisomy of which chromosome pair?

The condition of sex chromosomes in a male child with Down's syndrome will be:

In man,which of the following genotypes and phenotypes may be the correct result of aneuploidy in sex chromosomes?