instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
An allele that's always expressed over another is a dominant allele.
answer:
What's the term for an allele that's always expressed over another?


question:
The main advantage of urea is its very low toxicity.
answer:
The main advantage of urea is its very low what?


question:
When electrons move from one atom to another, they become ions.
answer:

When electrons move from one atom to another, they become what?