That hereditary characters are transmitted from parents to offspring via special elements in the ovum and spermatozoon, the so-called genes, has long been known.
(the so-called genes; has been known; T:long) Context(the so - called genes has been known,List([120, 160))):(That hereditary characters; are transmitted; from parents)
the so - called genes has been known,List([120, 160))
the so-called genes That hereditary characters
has been known are transmitted
T:long
from parents