A mutation in a promotor causes a disorder in which the blood clots too readily by
A) deleting a gene for a clotting factor.
B) blocking transcription of a clotting factor.
C) increasing susceptibility to a specific viral infection.
D) increasing the transcription rate of a particular clotting factor gene.
E) affecting how watery the blood is.

Question

Quizplus · Accepted Answer

A mutation in a promoter affects gene expression by either increasing or decreasing transcription rates. In this case, the mutation is causing increased clotting which suggests an increase in transcription of a clotting factor gene, making choice D the best choice.

A Mutation in a Promotor Causes a Disorder in Which