Cerebrovascular disease occurs due to:.a. the presence of an abnormal gene. b. tissue damage in the brain due to a shortage of blood supply. c. a deficit in acetylcholine. d. plaques in the brain.

b. tissue damage in the brain due to a shortage of blood supply

Explanation:

Cerebrovascular disease is a group of conditions, diseases, and disorders that affect the blood vessels and prevents blood supply to the brain.

If there is a blockage, malformation, or blood clot that prevents the brain cells from getting enough oxygen, it can lead to brain damage.

Causes of Cerebrovascular disease includes atherosclerosis i.e narrow arteries, thrombosis, blood clot in the artery of the brain,blood clot in a vein of the brain.

Example of Cerebrovascular diseases include stroke, transient ischemic attack (TIA), aneurysm, and vascular malformation.

b is dominant over the allele for the white fur.