A U.S. state (abbreviation of United States state) is any one of the 50 federated states of the United States of America that share sovereignty with the federal government. Because of this shared sovereignty, an American is a citizen both of the federal entity and of his or her state of domicile. Four states use the
exists and is an alternate of . The sequence of DNA bases (thymine, cytosine, adenine, and guanine) code for specific traits. The number of and which alleles you have (coded for my the DNA=genes) will determine traits such as eye color.
Eye color is determined by the differences in amounts and types of pigments present in the iris. Pigments are determined often by genetic alleles, however some conditions can â¦cause a change in eye color. I would have stopped here however you asked WHY do eyes have color, and not HOW do eyes have color. Hence you may suggest that eye color has some functionality, and you wish to query this. There is no solid link, however empirical studies have some correlations between lighter eye colors and earlier loss of vision (ARMD).