In which disorder is the $XXY$ karyotype present?

In the hexaploid wheat, the haploid $(n)$ and basic $(x)$ numbers of chromosomes are

Physical,psychomotor,and mental development is retarded in an individual affected with

Monosomy and trisomy can be represented as

In a human karyotype,if there are $45$ chromosomes with an $XO$ configuration,which disorder is present?

Down syndrome is caused by an extra chromosome in the $21$st pair. What percentage of offspring from an affected mother and a normal father will show the effect of this disorder (in $\%$)?