What assumption about the distribution of hereditary factors in the formation of gametes was introduced into the science of G. Mendel?

What assumption about the distribution of hereditary factors in the formation of gametes was introduced into the science of G. Mendel? What diagram is this shown in?

Mendel suggested that: these factors are constant, are present in the body in pairs and are transmitted from generation to generation through gametes, and only one hereditary factor from the pair enters the reproductive cell.

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