The movement of a gene from one linkage group to another is called

Sometimes,the presence of $XX$ and $XY$ in males is due to:

If a person has $45$ chromosomes with $XO$ chromosomal abnormality,then it is considered as which disorder?

Turner's syndrome in humans is caused by

$A$ pregnant woman who has undergone an amniocentesis test finds an extra $Barr$ body in her embryo. Which syndrome is likely to be associated with the embryo?

The trisomic condition of $Down's$ syndrome arises due to: