The loss of a chromosomal segment is due to

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:

Mark the correct match.

Which disorder is caused by autosomal primary non-disjunction?

Identify the disease on the basis of the following characters:
$(1)$ Short stature with a small round head.
$(2)$ Furrowed tongue and partially open mouth.
$(3)$ Palm is broad with a characteristic palm crease.

If the haploid chromosome number in a cell is $12$,then the monosomic number will be: