The above puppies are offspring from the same parents. Why don't the puppies look identical to each other? Do you think they are identical to their parents? Or do you think they have some traits from their mother and some from their father?
Just as you don't look exactly like your parents, neither do these puppies. Has anyone ever told you, “You have your father’s eyes”? or, “You have red hair like your grandmother; it must have skipped a generation.” You don't look identical to your parents or to your grandparents. But many of their traits are passed down to you.
Genetics seeks to answer why and how we, and all living things, inherit traits from the previous generation.
Image copyright Michael Pettigrew, 2014. www.shutterstock.com. Used under license from Shutterstock.com.