Some examples of physical traits in humans are eye color, hair color, earlobe attachment, dimples and the shape of a person's face. The determination of these traits in an individual is based on the person's genetic makeup. The understanding of genetics and inheritance of physical traits was first described by Gregor Mendel in his work with pea plants.
Every human cell contains approximately 25,000 to 35,000 genes, which carry the information used to give everyone a set of physical traits. These traits are inherited from an individual's parents. Other examples of physical traits that can be inherited include:
- Whether or not a person has freckles
- Whether or not a person has a chin cleft
- Curly or straight hair
- Ability to roll the tongue
- Almond- or round-shaped eyes