Tortoiseshell cats have an extra sex chromosome which causes their mottled fur colors; the different colors are a result of different X chromosomes being activated in random cells. This is called: a. x-inactivation

b. x-expression

c. x-activation (not this, I know because I submitted and it's not this)

d. y-inactivation

What is the main difference between the central nervous system (cns) and the peripheral nervous system (pns)? .the cns involves the brain and spinal cord, and the pns involves the body nerves. the cns involves the body nerves, and the pns involves the brain and spinal cord. the cns involves sensory neurons, and the pns involves motor neurons. the cns involves motor neurons, and the pns involves sensory neurons.