2006-12-25 20:28:06 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Biology
Since the genetic material has been duplicated, there are two identical copies of each chromosome in the cell. Identical chromosomes (called sister chromosomes) are attached to each other at a DNA element present on every chromosome called the centromere.The task of mitosis is to assure that one copy of each sister chromatid - and only one copy - goes to each daughter cell after cell division.
2006-12-25 20:40:23 · answer #1 · answered by Ana 3 · 0⤊ 0⤋
Erm... During the whole of mitosis, the chromosomes are identical. I think you are talking about Meiosis.
If it is meiosis, the reason would be crossing-over takes place in Diplotene which is a further stage of prophase I. When crossing-over do not take place, choromsomes are identical.
2006-12-25 21:46:59 · answer #2 · answered by PIPI B 4 · 0⤊ 0⤋
So that during cell division, the daughter cells have the same amount of chromosomes as the original cell. If its different, bad things happen dude. =D
2006-12-25 21:00:16 · answer #3 · answered by arsenal_chun17 3 · 0⤊ 0⤋
Each one of our tissues are made of cells that have different DNA structures. In order for the cell to make a copy of itself, it has to copy its DNA structure first so the cells know what kind of tissue it will become.
2006-12-27 07:24:37 · answer #4 · answered by jjefferson210 2 · 0⤊ 0⤋