Should one should see two sets of crossover maps for “me”, which comprise 22 from paternal and 22 from maternal? I assume my two “strands” for each chromosome pair are one entirely from my mother and one entirely from my father and there is no crossover or mixing up between the two strands whatsoever. Following on and if this is right, the cross overs occur only within one chromosome strand from, for example, the maternal grandparents only, if it is the maternal strand from the pair under consideration and vice versa for the paternal strand. Is that somewhere near the mark?