Question

Smallpox was once endemic in india and africa, where there were low frequencies of the allele for type a blood. what did this suggest to scientists?

Answer 1

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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