Re: Projection much?
Isn't this supposed to mean that after four generations, there's no genetic code from the fourth grandparent left?
If you lose 25% of parental DNA over 1 generation, that leaves 75%. You have 2 parents, so halve that to 37.5%
Over 5 generations (4th grandparent)
37.5% x 37.5% x 37.5% x 37.5% x 37.5% = 0.75%
That might seem like a low number, but consider that you have 32 4th-grandparents.