Which of the Following is Not a Type of Loss-Of-Function

Question

Which of the following is not a type of loss-of-function mutation?
A) conditional
B) hypomorphic
C) null
D) dominant-negative
E) ectopic

Accepted Answer

Conditional, hypomorphic, null, and dominant-negative mutations all result in reduced or absent function of a gene, whereas ectopic refers to a mutation affecting the timing, location, or level of gene expression.