Which of the Following BEST Describes Knockout Mice

Multiple Choice

Which of the following BEST describes knockout mice?

A) They have a gene of interest that has been fully disabled.
B) They have lower expression levels of a gene of interest.
C) They have higher expression levels of a gene of interest.
D) They have a point mutation in the gene of interest.
E) They have a gene removed, which results in lowered fertility.