Since Eve was formed out of a rib from Adam some Christians have grown up believing that men have one less rib than women, which they don't. Some anti-creationists have used this to mock Genesis.
But today, if someone loses their hand it doesn't mean that their children will be born without hands. Interestingly ribs are one of the few bones in the body that can grow back if removed as long as the periosteum, the tissue around the bone, is left intact.
So even Adam would have had the same number of ribs as everyone else.