Although the earth’s creatures differ widely, the code that controls many of their inherited characteristics is very stable and has served to maintain the distinction between basic kinds of creatures down through the ages.
एका पिढीची गुणलक्षणे दुसऱ्‍या पिढीत उतरवणारी सजीवांमधील ही एक रासायनिक प्रक्रिया आहे.