Genetics is defined as the scientific study of heredity and variation in living things.
What is Heredity?
Heredity, or inheritance, is defined as the transmission and expression of characteristics, or traits, in organisms from parents to their offspring.
It is observed that offsprings of man, and other animals and plants, usually resemble their parents and also resemble one another. This is because the offspring inherit characters or traits from their parents.
What is Variation?
Variation is defined as the differences which exist between parents and offspring, as well as among the offspring. Even though offspring may resemble their parents, they can differ also from them and from one another.
For example, all human beings have human features, but each differs from the other, hence each person can be recognized. These differences between individuals, of the same species, are called variations.