Human physical variation is the diverse range of physical traits that makes each human unique. It includes a variety of characteristics including height, weight, skin color, and facial features, among others. Human physical variation has been shaped by evolutionary forces such as natural selection and sexual selection over thousands of generations.
The primary source of human variation is genetic differences between individuals. These genetic variations are passed down from parents to their offspring through DNA mixing during reproduction. Genes contain the code for proteins and enzymes that control how all our traits develop during growth and development. Different combinations of these genes produce different outcomes in people’s physical attributes, making each person unique.
The environment also plays an important role in influencing human physical variation by changing the way genes express themselves into observable characteristics or phenotypes. For example, exposure to ultraviolet light can cause a mutation in melanin-producing cells which can lead to an increased production of this pigment resulting in darker skin tones or freckles in some people but not others with similar genetics who did not have this environmental exposure. Similarly, diet and nutrition can influence height and other characteristics related to body size such as fat distribution or muscle mass composition depending on what kind foods are consumed throughout life
Climate also affects human physical variation since it influences adaptations that help us survive the conditions present in a given region such as tropical climates where darker skin helps protect against sunburns while lighter skin tones provide better vitamin D absorption when living further away from equator regions with less sunlight available year round . Additionally climate affects clothing styles which may vary depending on if someone lives closer or farther away from the equator – with colder climates leading to heavier clothing options for warmth protection compared those living near warmer areas where cooler clothing choices would be more suitable for comfort .
Ultimately all forms of human physical variation have developed due to evolutionary processes like natural selection along with environmental factors influencing gene expression over long periods time – providing us with wide range of diversity across entire species that allow us adapt better our everchanging world .
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