That type of blood increased susceptibility to smallpox.
Which of the following best explains why, given the A allele's vulnerability to smallpox, natural selection did not eradicate it?
Diseases that the A type is not vulnerable to can affect other blood types.
Do you think that diseases can impact natural selection in any way?
A species will have a better chance of surviving than others if it has evolved tolerance to particular germs.
Why did people acquire dark skin?
- People who lived in regions with strong sunlight evolved dark skin tones as a result of natural selection to guard against ultraviolet (UV) rays, primarily to prevent their bodies from folate depletion.
- UV rays from the sun are what led to skin pigmentation during evolution.
Learn more about ultraviolet (UV) rays
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