The number of Barr bodies in a $XXXX$ female is:

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 $\%$)?

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

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

Symptoms representing a particular disease due to chromosomal abnormalities are referred to as:

Feminized males have . . . . . . chromosomes.