How have the historic levels of melanin in human populations changed due to migration?

Question

• 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.

Answer 1

Humans that produced more melanin became more common as populations migrated toward the equator. This is because melanin protects the skin from UV radiation and helps prevent skin damage and skin cancer. As populations migrated towards regions with higher UV radiation, there was a selective advantage for individuals with more melanin to protect against this radiation. Conversely, in regions with less UV radiation, there was less of a selective advantage for individuals to have high levels of melanin, therefore humans that produced less melanin became more common.

Answer 2

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

Answer 3

thx @GHOST FACE 100% on Genetic Variation Quick Check

Unit 8: Lesson 7