In Klinefelter syndrome . . . . . . .

The chromosomal condition $2n-1$ is an example of what?

Example for autosomal hyper aneuploidy is

Choose the correct answer regarding the following statements:
$(i)$ Sickle-cell anaemia is controlled by three pairs of alleles.
$(ii)$ Trisomy is a chromosomal disorder.
$(iii)$ $47$ chromosomes are present in a person having Turner's syndrome.

$A$: Turner's syndrome generally does not occur in males.
$R$: Foetus with $44 + YO$ complement generally dies.

In which disorder is the $XXY$ karyotype present?