I believe the synaptonemal complex that temporarily forms between homologous chromosomes to allow for crossing over is only present in prophase I. As the complex is not present in metaphase I (or any of the other phases) recombination can only occur during prophase I.
Also a good way to think about it imo is that in prophase, the stuff is lining up like next to each other and crossing over happens while in metaphase, they are all aligned top to bottom to split later on.
This site uses cookies to help personalize content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies and terms of service.
