Red, curly hair runs in some families and black, straight hair in others.
Some families include many people who live into their late nineties or
beyond. Eye and hair color as well as height, longevity, and other family traits
are inherited from parents and passed on to children in a cellular material
called genes. Some diseases can also be inherited or caused by changes in
one's own genes or those of a parent. Inheritance is a characteristic of all
living things. You can actually change someone or something's genes. This is
called genetic engineering. Technically, gene…
