How have the historic levels of melanin in human populations changed due to migration?
• Humans that produced less melanin became more common as populations migrated away from the equator.
• Humans that produced less melanin became more common as populations migrated toward the equator.
. Humans that produced more melanin became more common as populations migrated toward the equator.
• Humans that produced more melanin became more common as populations migrated away from the equator.
Here's the answers
1. humans that produced less melanin became ore common as populations migrated away from the equator
2. the proportion of tortoises with the ability to extend their necks a long distance would increase.
3. the environment changed such that green toads can blend into their surroundings better.
4. process used to develop new organisms with desirable characteristics
5. selective breeding
thx @GHOST FACE 100% on Genetic Variation Quick Check
Unit 8: Lesson 7
To answer this question, we need to understand how the production of melanin in human populations is influenced by migration patterns.
Melanin is the pigment responsible for determining the color of our skin, hair, and eyes. The primary purpose of melanin is to protect the skin from the harmful effects of ultraviolet (UV) radiation from the sun. The closer a population is to the equator, the more intense the UV radiation is, so more melanin production is needed to protect the skin.
Historically, human populations have migrated for various reasons, including in search of better resources, escaping conflicts, or exploring new territories. As populations migrated away from the equator, they moved to regions with lower levels of UV radiation. In these regions, there was less need for high levels of melanin, as the risk of UV damage was lower.
Therefore, over time, humans that produced less melanin became more common as populations migrated away from the equator. This is because individuals with lower melanin production were at a lower risk of UV damage and could still survive and reproduce effectively in these regions with lower UV radiation.
On the other hand, as populations migrated toward the equator, they moved to regions with higher levels of UV radiation. In these regions, individuals with higher levels of melanin production had an advantage, as they were better protected against the harmful effects of UV radiation. This led to humans that produced more melanin becoming more common as populations migrated toward the equator.
In summary, the answer to the question is: Humans that produced less melanin became more common as populations migrated away from the equator.