Answer:
each of our genes is physically separate from the others even if siblings. After all, kids get their genes from the same parents. But brothers and sisters don't look exactly alike because everyone (including parents) actually has two copies of most of their genes. And these copies can be different. Parents pass one of their two copies of each of their genes to their kids.It proposes that although kids may grow up in the same family, their experiences are very different. Part of this difference may be because they're not at the same age during major family events, such as a divorce, a death or a move across country. Thus, these events affect each sibling differently.
by the way a gene is the basic physical and functional unit of heredity. Genes are made up of DNA. Some genes act as instructions to make molecules called proteins. However, many genes do not code for proteins. In humans, genes vary in size from a few hundred DNA bases to more than 2 million bases.
