How have the historic levels of Madeline in human populations change parents due to migration humans that produced more melanin became more common as populations migrated away from the equator humans that produce less melon became more common as population away from the equator humans that produce less melanin became more common as populations migrated towards the equator humans that produced more Madeline became more common as populations migrated toward the equator
The correct answer is: humans that produce less melanin became more common as populations migrated towards the equator.
The historic levels of melanin in human populations have changed due to migration. As populations migrated away from the equator, humans that produce more melanin became more common. This is because increased melanin production helps protect against harmful ultraviolet (UV) radiation, which is stronger near the equator. So, to adapt to the higher levels of UV radiation in these regions, humans with more melanin were favored by natural selection.
On the other hand, as populations migrated towards the equator, humans that produce less melanin became more common. The lower levels of UV radiation near the equator make it less necessary for individuals to have high amounts of melanin for protection. Consequently, humans with less melanin were favored in these regions.
To summarize, the distribution of melanin in human populations has changed as they migrated away from or towards the equator. Humans that produce more melanin became more common as populations migrated away from the equator, while humans that produce less melanin became more common as populations migrated towards the equator.
To understand how the historic levels of melanin in human populations have changed due to migration, let's break down the question and address each statement:
1. "Humans that produced more melanin became more common as populations migrated away from the equator": This statement suggests that the further away from the equator humans migrated, the more melanin they produced. Melanin is the pigment responsible for the color of our skin, hair, and eyes. It provides protection against the harmful effects of the sun's ultraviolet (UV) radiation. Therefore, in regions closer to the equator where sunlight is more intense, there is a selective advantage for individuals with higher levels of melanin, as it helps to protect their skin from UV damage. This adaptation is commonly observed in populations with darker skin tones.
2. "Humans that produce less melanin became more common as populations migrated towards the equator": This statement indicates that as populations migrated towards the equator, individuals who produce less melanin became more prevalent. However, the historical evidence and scientific understanding suggest the opposite trend. As populations migrated towards the equator, where sunlight is more intense, there was an evolutionary pressure for individuals to have increased melanin production to protect themselves from the higher levels of UV radiation. This led to the prevalence of darker skin tones in populations closer to the equator.
In summary, the correct understanding is that humans who migrated away from the equator, into regions with less intense sunlight, would have had reduced selective pressure for high levels of melanin production. As a result, populations in these regions could have developed lighter skin tones over time. However, humans migrating towards the equator would experience increased UV radiation, leading to higher selective pressure for increased melanin production and darker skin tones.