before prophase i chromatid arms in a chromosome are in the synaptonemal complex.
before prophase i chromatid arms in a chromosome are?
the synaptonemal complex
sister chromatid exchange (sce) is the exchange of genetic information between two sister chromatids. sces can occur during mitosis or meiosis. sces appear to primarily reflect dna recombinational repair processes responding to dna damage (see articles sister chromatids and sister chromatid exchange).





















































"non-sister chromatids", on the other hand, refers to either of the two chromatids of paired homologous chromosomes, that is, the pairing of a paternal chromosome and a maternal chromosome. in chromosomal crossovers, non-sister (homologous) chromatids form chiasmata to exchange genetic material during the prophase i of meiosis (see homologous chromosome pair).
chromatid
section::::mitotic prophase.:beginning of nucleoli breakdown.





















































the nucleoli begin to break down in prophase, resulting in the discontinuation of ribosome production. this indicates a redirection of cellular energy from general cellular metabolism to cellular division. the nuclear envelope stays intact during this process.





















































section::::meiotic prophase.





















































meiosis involves two rounds of chromosome segregation and thus undergoes prophase twice, resulting in prophase i and prophase ii. prophase i the most complex phase in all of meiosis because homologous chromosomes must pair and exchange genetic information. prophase ii is very similar to mitotic prophase.





















































section::::meiotic prophase.:prophase i.
prophase