how many ancestors does an average person have what is the probability of an ancestor sharing a common ancestor what is the probability of a person a common ancestor? population of 1500 what is the percentage of overlap between two ancestors how many descendants does the average person have how many generations of surviving child how much of the world has at least one ancestor average generation length what is the probability of a random cross over what is the probability of a shared ancestor which is the highest probability of an ancestor being shared? which percent is the probability of a random intermixed population how many people are ancestor of 1500 why would it cause fractional overlap between humans how many offspring are there today? what is the fractional overlap between ancestry how many people ancestors how many people on average in one generation how do we know if two people have an ancestor