Hard inheritance is the exact opposite of the term
soft inheritance, coined by
Ernst Mayr to contrast ideas about
inheritance. Hard inheritance states that characteristics of an organism's offspring (passed on through
DNA) will not be affected by the actions that the
parental organism performs during its lifetime. For example: a medieval
blacksmith who uses only his right arm to
forge steel will not sire a son with a stronger right arm than left because the blacksmith's actions do not alter his genetic code.