How is it that people look so much like their great great grandfather, despite have generations of other bloodlines mixed in?

Question

How is it that people look so much like their great great grandfather, despite have generations of other bloodlines mixed in?

In: Biology

Answer 1

I hope this gets explained, my sister looks adopted within the immediate family (majority dark hair dsrk eyes vs blonde hair blue eyes)

However shes the spitting image of our grandmother

I think its something to do with dna and genetics skipping generations…. hope an adultier adult can explain