If somatic cells of a human male contain a single Barr body,the genetic composition of the person would be:

Which one of the following is a type of hyperploidy?

Given below are two statements :
Statement $I$ : Down's syndrome is caused by the absence of one of the $X$-chromosomes.
Statement $II$ : Turner's syndrome is caused by the presence of an additional copy of the chromosomes.
In the light of the above statements, choose the correct answer from the options given below :

The Philadelphia chromosome is found in patients suffering from

Loss or gain of a segment of $DNA$ results in

The number of chromosomes in Klinefelter's syndrome is