How many genetic ancestors does the average person have?
April 10, 2017 8:46 AM Subscribe
Because of crossing over during meiosis, our genetic ancestry is a mix of a bunch of our ancestors. But how many ancestors, on average? (Or, better, what does the number-of-genetic-ancestors curve look like?) I know that it's probably not all of our ancestors, because there are a limited number of crossovers during a given recombination event. But how does all that math work out? What are the chances that we have lineal copies of at least a chunk of a chromosome from all of our great-grandparents? What about 5 generations back? 10?