Explain homologous recombination in meiosis.
Rather than a randomly occurring break, there is a purposeful ds break.
One chromosome is cut and an exonuclease exposes the single stranded 3' end. Strand invasion joins the chromosomes, creating a double Hilliday junciton.
Two things can occur. The chromosomes can be cut directly, leading to a single region of crossover. Or, they can cut in different places, leading to several crossover regions