Http://www.ema.co.tt/docs/events/iyb/types%20of%20biodiversity.pdf
Can be caused by radiation.
<span> Chimpanzees and humans have nearly identical DNA. </span>
During the interphase, the cells grows, carries out normal functions and duplicate its DNA. So we have to two chomosomes with two chromatids in each chromosome.
There are the phase G1, G, and S phase.
Hope this helps !
Photon