Genes are DNA sequence that generally serve what function?

Genes are DNA sequence that generally serve what function?

In biology, a gene is a sequence of nucleotides in DNA or RNA that encodes the synthesis of a gene product, either RNA or protein. During gene expression, the DNA is first copied into RNA. The RNA can be directly functional or be the intermediate template for a protein that performs a function.

Explanation:

the fossil record provides evidence of a common ancestor to many species.