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

Q: Some gametophytes develop underground and form mycorrhizal associations with fungi.

A: Some gametophytes develop underground and form mycorrhizal associations with what?
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Q: An allele that's always expressed over another is a dominant allele.

A: What's the term for an allele that's always expressed over another?
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Q: Reflexes normal bodily occurrence can cause skeletal muscles to involuntarily contract.

A:
What normal bodily occurrence can cause skeletal muscles to involuntarily contract?
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