What is an allele? A. The gene for a specific trait.

B. One of 2 copies of a gene.

C. The same thing as a gene​

B

Explanation:

one of two or more alternative forms of a gene that arise by mutation and are found at the same place on a chromosome.

the answer to your question is slate

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link: