Albinism is a genetic mutation that results in some animals being born without the enzyme that produces the pigment for skin and eye color. all but one statement is a possible explanation for this mutation. which is not an explanation?

D)The organism gained an extra chromosome because of a non-disjunction.

Explanation:

The organism gained an extra chromosome because of a non-disjunction. This would likely cause other mutations to appear. This explanation would not cause the organism to be missing the gene needed for pigment.

Tumor suppressor genes typically inhibit division of cancer cells and preventing tumor formation.Mutation in this gene result in loss of function so it is typically recessive. This means that tumor suppressor genes acts as brake  in formation of cancer cell. It prevents the growth of tumors. If one brake (one tumor suppressor gene) is defective it can still stop the car or cancer formation. However, since mutation in tumor suppressor gene is recessive, if two brakes are defective the car will not stop. Or the tumor will be expressed and be formed.