A two-party system is a party system in which two major political parties dominate the political landscape. In the U.S. the two political parties are known as the Democratic party and the Republican party. Whichever one typically holds the majority is usually referred to as the majority or governing party while the other is the minority or opposition party. Although around the world the term has different senses.
Akira was born with genes that enabled muscle coordination, but his environmental experiences never supported the development of his potential athletic ability, so he never became a professional athlete. This example illustrates the concept of a trait being multifactorial
