Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
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Question: The amniotic egg first evolved in reptiles.

Answer: The amniotic egg first evolved in what species?


Question: Particle accelerators can nuclear fusion in stars be simulated.

Answer: How can nuclear fusion in stars be simulated?


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

Answer:
How many possible alleles do the majority of human genes have?