please explain why crossing over between non-sister chromatids of homologous chromosomes cannot occur during mitosis
2006-11-30 11:27:16 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Biology
Explain why crossing over between non-sister chromatids of homologous chromosomes cannot occur during mitosis.
What is the diploid number of chromosomes in fruit flies?
2006-11-30 11:38:34 · update #1
mitosis is not the 2nd part of meiosis.
crossing over does not happen in mitosis basically because there is no need to do so.
crossing over occurs in the 1st part of meiosis when the 2 pairs of homologous chromosomes come together in the prophase part of meiosis--one pair of chromosomes from each parent. that is where the exhcange of genes occur in order to add variation between the 4 daughter cells.
in mitosis, the homologous chromosomes do not come together. the DNA simply copies itself and will eventually lead to the split into 2 identical daughter cells.
2006-11-30 11:53:48 · answer #1 · answered by Anonymous · 1⤊ 0⤋
Crossing over typically occurs in meiotic metaphase I , during synapsis formation when there are tetrads present. Since the chromosomes in mitosis don't display synapsis formation, it's not likely that crossing over and recombination will occur.
I believe that Drosophila melanogaster has 8 (4 pair) chromo.;
2n=8
2006-11-30 21:24:59 · answer #2 · answered by ursaitaliano70 7 · 1⤊ 0⤋
This is the second part of meiosis, right?
The sister chromatids do not meet at the plate, thus they wouldn't be able to cross between their other counterparts.
2006-11-30 19:30:23 · answer #3 · answered by bansri47 4 · 2⤊ 0⤋
Bio means the life in latin and ology means study of in latin!
its actually very simple
2006-11-30 19:29:20 · answer #4 · answered by Pumpkin Headed Murderer 2 · 0⤊ 3⤋