As I said, the genome is overwhelmingly stable, these swaps are very tiny in relation to the total, when they occur at all.
“The recombination frequency will be 50% when two genes are located on different chromosomes or when they are widely separated on the same chromosome. This is a consequence of independent assortment.”
Am I misunderstanding this? To me this means that alleles widely separated on the same parent chromosome are pretty likely to end up on separate although homologous chromosomes in the offspring.
Different wiki page:
“An exception is towards the end of meiosis, after crossing over has occurred, because sections of each sister chromatid may have been exchanged with corresponding sections of the homologous chromatids with which they are paired during meiosis. Homologous chromosomes might or might not be the same as each other because they derive from different parents.”
https://en.wikipedia.org/wiki/Sister_chromatids