Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Q: The majority of human genes have two or more possible alleles.

A: How many possible alleles do the majority of human genes have?
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Q: Elements are pure substances that make up all matter.

A: Elements are pure substances that make up what?
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Q: Female gender typically experiences growth spurts first.

A:
Which gender typically experiences growth spurts first?
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