Heredity (n.) is contrasted with environment in that heredity is when you wind up with your mother's complexion while environment is when you wind up with your father's car.
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Heredity (n.) is something you believe in if you have a very bright child.
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Heredity (n.) is the transmission of unpleasant characteristics from the other side of the family.
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Heredity (n.) is transmitted by both parents: many a girl is the picture of her father and the sound track of her mother.
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Heredity (n.) is what sets the parents of a teenager wondering about each other.