The number of chromosomes in Turner's syndrome is

Example for autosomal hyper aneuploidy is

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?

In Down's syndrome $(Mongolism)$,each cell has how many chromosomes?

In Turner syndrome,a female has:

The Barr body is observed in