Question

Why is there so much variation in human skin coloration? a. This occurred because humans underwent natural selection, which resulted in traits that conferred advantages to humans becoming fixed in populations. b. This occurred because alleles that are harmful in one environmental context may be beneficial in another. c. This occurred because humans are found in areas that range from high-UV-light environments to low-UV-light environments. d. This occurred because skin coloration results in different advantages depending on the levels of sun in the region.e. All of these.

Answer 1

The variation in human skin coloration is due to natural selection, with different skin colors offering evolutionary advantages in different UV-light environments and cultural factors also influencing regional standards of beauty.

Step-by-step explanation:

There is a significant variation in human skin coloration due to several evolutionary factors. Answering the student's question, the best option would be e. All of these. The variation can be attributed to natural selection where traits that confer an advantage in certain environments become prevalent in those populations. The concept of directional selection helps explain why darker skin, which protects against the sun's ultraviolet rays, is more common in sunny regions. Conversely, lighter skin can be advantageous in sunlight-deprived areas, like northern Europe, due to its efficiency in producing Vitamin D from less intense sunlight. Additionally, cultural factors and sexual selection have influenced skin color variations based on regional standards of beauty and attraction.

Answer 2

e. All of these.

Step-by-step explanation:

• The skin in humans ranges from darkest to the lightest color, as a result of genetic makeup, exposure to the sun rays, skin pigmentation may be either due to the evolutionary process of natural selection, and it may be due to the biochemical effects of the UV rays.

• As the pigment in the skin of humans is affected by the content of melanin in the body that causes the determination of skins cells of the darker colored humans, and the light skin is determined by the bluish-white tissues under the dermis and the hemoglobin.

• The emergence of skin pigments dates back to 1.2 billion years ago. When the harsh climatic conditions drove the early humans into arid and open landscapes. In general, the people living near to equator have darkly pigmented than those living in poles are lightly pigmented.