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

Epicanthus is a symptom of:

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:

What is the significance of Barr bodies and drumsticks to geneticists and biologists?

Mongolism syndrome is caused by

What is the sex chromosome complement in a male child with Down syndrome?