Some likenesses between children and parents, such as eye color in human beings, or fruit or flower color in plants, are inherited. Other likenesses, such as people's table manners or carpentry skills, are learned. For offspring to resemble their parents, there must be a reliable way to transfer information from one generation to the next. In some kinds of organisms, all the genes come from a single parent, whereas in organisms that have sexes, typically half of the genes come from each parent. People have different external features, such as the size, shape, and color of hair, skin, and eyes, but they are more like one another than like other animals.
All animals have offspring, usually with two parents involved.
People may prevent some animals from producing offspring. Organize information in simple tables and graphs and identify relationships they reveal.