The arrangement of chromosomes in the order of decreasing length is termed as:

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

In which of the following disorders is the symptom of gynaecomastia seen in individuals?

In $Drosophila \text{ } melanogaster$, $3$ pairs of autosomes and sex chromosomes of $XO$ type give rise to a normal male in appearance. In humans, $22$ pairs of autosomes and $XO$ type of sex chromosomes result in:

When the chromosome number of a given organism has one additional chromosome in one of the homologous pairs,the condition is known as . . . . . .

What is the chromosomal constitution in Klinefelter syndrome due to trisomy?