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1. What is a mutation?
2. Which of the following characteristics show discontinuous variation?
3. Which of these phenotypes is affected by both environmental and genetic factors?
4. An island’s entire population of a species of butterfly are descended from just two parents. These were introduced from the mainland.
Which of the following statements about this species of butterfly, compared with that of the mainland, is correct?
5. The graph below shows the height of bean plants grown from 1000 bean seeds.
What variation do the plants show?
6. A woman who has blood group A and a man who has blood group B have four children, each with a different blood group A, B, AB, and O.
What variation does this show?
7. Which row best describes human blood groups?