The result of mitosis is that the daughter cells end up with the same number of

Question

The result of mitosis is that the daughter cells end up with the same number of chromosomes that the parent cell had. Imagine an organism has 4 chromosomes total (let's call them chromosomes A,B,C,D). During cell division, each chromosome gets duplicated and then divided resulting in two daughter cells with 4 chromosomes each. Another way to accomplish this would be to divide into 2 daughter cells first and then duplicate each chromosome and have the sister chromatids separate. This would also give a resulting 4 total chromosomes. Do you think this would be an equally good way of organizing the cell cyle? Why do you suppose that evolution has not led to this alternative? Select the statement below that BEST explains your answer.

-This is a good way to organize the cell cycle as long as cytokinesis doesn't happen. This method already happnes in fruit flies. The cell can save energy and time by dividing genetic material first and then copying it later. Evolution has not led to this alternative because it can only happen in specific organisms.

-By dividing first and then duplicating, the two resulting daughter cells would not be identical. The replication that occurs after division will be error-prone and generate too many mutations. This would not be advantageous for organisms and would likely be selected against during evolution.

-This is not a good way of organizing the cell cycle. The number of chromosomes will remain the same but the chromosomes would be very different from the ABCD parent cell and from each other. The role of mitosis is to generate identical daughter cells. Chromosomes carry the genetic information required for all the cells functions. If a daughter cell was missing half of its genetic information it is likely it would not be able to perform all functions required for survival.

-By dividing first and then duplicating, the two resulting daughter cells would not be identical. For example, one daughter cell could get chromosomes A and B and the other C and D. After the duplication event each daughter cell would have four chromosomes but one would have AABB and the other would have CCDD.

Explanation / Answer

4Th options seems to suit best. because its very obvious that the parental chromosome i.e. ABCD would be first segregated if cell divides first, and each daughetr would have either AB/CD/BC/AD/AC/BD. But all four chromosome wll not be present thus, result in two daughter cells that will not have identical genetic make up.

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