Which disorder is indicated by the following karyotype?

If a female individual has a small round head,furrowed tongue,partially open mouth,and a broad palm with a characteristic palm crease,and also exhibits retarded physical,psychomotor,and mental development,the karyotype analysis of such an individual will show:

$A$ human female with Turner's syndrome:

What is Down's syndrome? Give its symptoms and cause. Why is it that the chances of having a child with Down's syndrome increase if the age of the mother exceeds forty years?

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

Mongolism syndrome is caused by