X Inactivation

What is a notable characteristic of calico and tortoiseshell cats?

• They are always male

• They have only one X chromosome

• They are almost always female

• They are sterile

In female cells, what is the term for the inactive X-chromosome that condenses into a small, dense structure?

• Active X

• Y-chromosome

• Barr Body

• Centromere

During early embryonic development in female mammals, how is the inactivation of one X-chromosome determined in individual stem cells?

• Both X-chromosomes remain active

• The paternal X-chromosome is always inactivated

• The maternal X-chromosome is always inactivated

• One X-chromosome is randomly inactivated

What genetic condition can result in a male cat exhibiting a calico coat pattern?

• Having only one X chromosome

• Having an XY genotype

• Having an XXY genotype

• Having a YYY genotype