Natural selection gets weaker after our reproductive life starts. Once we are able to have children, we can give our genes to a future generation. If a gene has not killed you, or otherwise prevented you from having a child, then that gene will be passed on.
 |
 |
 |
 |
 |
 |
 |
 |
 |
|
|
|
|
|
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
