Rephrasing question: does crossover happen after sperm and egg meet each other, but before formed fetus starts to grow?
As I understand sperm and egg of human are haploid cells. That means this cells undergone meiosis and chromosomes crossover before meet each other. If so then crossover happened between a pair of chromosomes which came from parents of the parent of the fetus, not between chromosomes of mother and father of the fetus.
Am I wrong?