Usually it's a personality trait, some skill we know, or a talent that not many people have. The term usually has negative connotations, but some of the results of mutations are not harmful. Over the centuries though, DNA has evolved, changed and mutated, so some of us bear little similarities to our ancestors in regard to things like physical features and height. It is the rarest hair color among humans and is often associated with very fair skin, light colored eyes and freckles. Green eyes are actually a form of brown eyes caused by the amount of melanin that is found in the iris, while Amber eyes are a result of extra yellow-colored pigment in the iris and Grey eyes are caused by deposits of collagen in the iris. Since blond hair was rare and prized, people possessing it were more often chosen as mates. The pigment pheomelanin is what gives hair its red color. Gingers get picked on, often called carrot tops, and sometimes kids offer to connect the dots of their freckles. The psychologists from Augsburg University in Minnesota say the reason men dig blondes dates back to our caveman days because lighter hair indicated youth and fertility. But how did red hair happen in the first place?
I have blue eyes! For a recessive trait to be inherited, both parents have to be carrying a copy of the trait in their DNA. But how did red hair happen in the first place? It tells our cells what do do as we develop. Soon after, people with fiery hair began migrating to Europe. Even though many people go to great lengths to appear like everybody else, we almost all have something that makes us different from the next person. Husky dogs, for example, often have two different colored eyes. It is true that some of these physical features are caused by genetic mutations, but, in the end, these are just some of the things that make us different. Men like blondes, they also like brunettes and redheads and slim and thick etc. Long Story "Men really DO prefer blondes! It is generally accepted in the scientific world that modern homo sapiens first originated in Africa about two-hundred thousand years ago. These genetic mutations are often passed down from parent to child, which is why we often resemble our parents and sometimes inherit diseases like diabetes, sickle-cell anemia, certain cancers, asthma and, sometimes, a resistance to specific diseases. Source What Is a Genetic Mutation? Over the centuries though, DNA has evolved, changed and mutated, so some of us bear little similarities to our ancestors in regard to things like physical features and height. The psychologists from Augsburg University in Minnesota say the reason men dig blondes dates back to our caveman days because lighter hair indicated youth and fertility. If one parent has blue eyes and the other has brown, the resulting children will generally, but not always, have brown eyes as they are the more dominant trait. Because of the mutation of an adjacent gene, HERC2, OCA2 turned itself off, like a switch, and allowed humans' eyes to turn blue or, rather, disallowed the eyes to be colored by pigment. The other causes of Heterochromia are disease and injury. People who have these differences often wish they didn't, while those who don't have them often wish they did. There are millions of "dumb blond" jokes too, and some people are creeped out by people with multi-colored eyes. Violet, purple and red eyes can only occur with albinism. Some of us, however, have physical characteristics that make us stand out in a crowd: The genetic culprit is the gene melanocortin 1 receptor, or MC1R. I rest my case. So do not fill out your application for Xavier's School for Gifted Youngsters just yet.
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