Multiple choice

Which of the following statements is CORRECT about the worldwide frequency distribution of blood types B and O?

  1. They very nicely overlap indicating that whatever factors have been selecting for type B have also been at work selecting for type O.

  2. Where type O is relatively high in frequency, type B is ultimately relatively low.

  3. They both are very alike to the distribution pattern of skin colour indicating that the same factors have been favoured for blood types and skin pigmentation.

  4. Where type B is relatively high in frequency, type O is relatively low.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Type O is most common among Native Americans. However, type B is extremely low in Americans.

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