Our genes are passed down to us from our two biological parents. We all have two copies of most of our genes; we inherit one copy of each gene from our biological dad, and the other copy from our biological mom. We are a combination of our parents’ genes, but we’re each a unique combination, which is why siblings are not identical. Just like we inherited our genes from our parents, we will then pass on a copy of each of our genes to any future biological children.