‘Heredity’ refers to the passing on of genes from parents to offspring, although the study of heredity is ancient most early ideas as to how traits were passed on lacked scientific understanding of genetics and were based more on observations.
It was not until the 1900’s that Gregor Mendel was able to demonstrate that inheritance of traits followed specific genetic patters by mapping the passage of traits passed through generations when crossbreeding pea plants. This basic framework of understanding is referred to as ‘Classical Genetics’.
This video explores more recent scientific discoveries in the field of heredity, the kinds of trait that can be passed on and the varied ways in which they are inherited.
From Crash Course: Biology on YouTube by Hank Green.