Answer the following question given this paragraph: 

The majority of human genes have two or more possible alleles. Differences in alleles account for the considerable genetic variation among people. In fact, most human genetic variation is the result of differences in individual DNA bases within alleles.


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

 Choices:

- three or more

- two or less

- less than four

- two or more

A:
two or more
