Question

which structure is known as unit of inheritance and why

Answer 1

gene is known as the structure of inheritance

Answer 2

A gene is a DNA segment that provides all the information to produce a single protein or functional RNA. The protein may have a structural role in the body, or it may be enzyme that does other things.

It is the unit of inheritance because any thing less would not give enough information. Any more would give two proteins. The meaning of “unit” is a single entity.