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?


[Q]: Urea is made in the liver and excreted in urine.
[A]: What is made in the liver and excreted in urine?


[Q]: Chinook winds occur when air is forced over a mountain range.
[A]:
What type of winds occur when air is forced over a mountain range?