The diagrammatic representation of the chromosomes of an individual is called

The reduction of one pair of chromosomes in humans is due to:

The number of chromosomes in Down's syndrome is

Find out the correct pair.

In which genetic condition,each cell in the affected person has three sex chromosomes $XXY$?

In humans,sometimes during gametogenesis,sex chromosomes do not separate,resulting in a chromosome number of $45$,$47$,or $48$. In this condition,which of the following genotype and phenotype combinations is correct?