Crossing over, true is;
Crossing over is the exchange of genetic material between non sister chromatids of homologous chromosomes occuring during pachytene stage of prophase I of meiosis.Recombination of genes in the same chromosome is brought about by crossing over. Ref: PRINCIPLES OF GENETICS, By Eldon John Gardner, Michael J. Simmons, D. Peter Snustad, 8th Edition, Page 163
Occurs during diplotene stage
Between non sister chromatids of homologous chromosomes
Between sister chromatids of homologous chromosomes
Between non homologous chromosomes sister chromatids