With both genotypic and phenotypic information at hand, they can then get a handle on how specific traits are inherited, and identify genes responsible for these traits.
(they; can get; a handle on how specific traits are inherited; T:then) (how specific traits; are inherited; ) (they; identify; genes responsible for these traits; T:then)
they how specific traits they
can get are inherited identify
a handle on how specific traits are inherited T:then
genes responsible for these traits T:then