Can you tell me if the disorder, hypercholesterolemia, a recessive, dominant, coodominant, sex-linked, or chromosomal disorder?

No: This is simplistic and if your were asked this question by a teacher, you need to straighten things out. Type ii hypercholesterolemia caused by defective LDL receptors is a semi-dominant with one dose being bad and two being much worse. Other forms have other inheritance, but most high cholesterol is polygenic (several loci) with an environmental and lifestyle influence as well.