Indicate whether each of the following descriptions better applies to forward (F) or reverse (R) genetics. Your answer would be a four-letter string composed of letters F and R only, e.g. RFFF.
( ) It involves new gene discovery by genetic screens.
( ) It may also be called genome editing.
( ) In this approach, mutations are introduced deterministically in a known gene.
( ) It is involved in creating knockout mice lacking a particular gene.