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

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

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


Input: Consider Input: Solids are categorized by the forces holding the individual atoms, ions, or molecules together.

Output: What is categorized by the forces holding the individual atoms, ions, or molecules together?


Input: Consider Input: Children resemble their parents because they have similar dna.


Output: Which best explains why children resemble their parents?