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Ok, so lets say i have animal cell A. The DNA in the nucleus has compacted to form 4 different chromosomes, each one shaped like an 'X' [with 2 chromatids and one centromere]. When the cell splits, the kinetochore fibers pull apart each of the 4 chromosomes, yielding 2 separate cells each with 4 HALF-chromosomes or 'chromatids'. Doesnt this mean that every time a cell does binary fission, it loses HALF its genetic information?

I just fail to see how this equation is even.
One cell has 4 chromosomes shaped like X's. It splits and makes 2 separate cells with 4 half chromosomes each [they are just shaped like lines]

PLEASE explain how cells formed by binary fission don't have HALF the genetic information as the original cell. This is really bothering me, haha.

2007-12-10 14:06:49 · 4 answers · asked by Anonymous in Science & Mathematics Biology

4 answers

They chromosomes will replicate again in Interphase (s) to make 4. If the cell has made chromosomes (compacted), it has already doubled the DNA. For example, humans have 46 chromosomes. In Interphase (s) it doubles to 92. Then in mitosis it will split back to 46. Hope this helps. Binary fission is just bacteria replication. It works just like mitosis

2007-12-10 14:28:59 · answer #1 · answered by Jennie K 2 · 1 0

Review the process of mitosis.
During mitotic anaphase each chromosome separates into
two chromatids which are guided (not really pulled by fibers)
to opposite poles. In the case that you're describing, four
chromatids migrate to each pole. In late anaphase, and early telophase the chromatids can now be called "single chromosomes". In telophase you have four single chromosomes
in each newly formed daughter cell. Each new daughter cell goes into interphase;the single chromosomes lengthen into a filament like configuration called chromatin. During this
stage each single chromosome DUPLICATES. When the cell is ready to split again, the chromosomes shorten and thicken forming two identical chromatids held together by a centromere. These are the chromosomes that you described as an "X", that can be seen in prophase. Each new cell will have four of these chromosomes.
This process occurs in the nucleus of cells undergoing binary fission. The process of mitosis MAINTAINS the chromosome number.

2007-12-10 14:38:27 · answer #2 · answered by ursaitaliano70 7 · 1 0

Mitosis is to offer 2 same daughter cells, jointly as meiosis is for making gametes for sexual replica. Meiosis tailored from mitosis (asexual replica to sexual). So until eventually now meiosis happens, the two be certain chromosomes that an organism have been given from his be certain mirror, forming 2 duplicated chromosomes. throughout prophase I, the chromosomes synapse and go over. throughout metaphase I, they line as much as split. the importance is that 4 haploid cells are produced with each physique being unique in this is composition of alleles in genes. in reality the dummy answer is to offer extra genetic version than if 2 2 be certain chromatids have been positioned into prophase I.

2016-12-10 19:10:36 · answer #3 · answered by cornelius 4 · 0 0

MITOSIS is the complete replication of a cell. The DNA in a cell nucleus completely replicates before MITOSIS will take place meaning that the new cell will have the same amount of genetic information in it.
You were thinking of MEIOSIS

2007-12-10 14:26:28 · answer #4 · answered by Anonymous · 1 0

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