You think you know Biology? Cells/Mitosis Division?

  • Thread starter Thread starter Nayeem H
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Nayeem H

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A student observed a cell under the microscope just before mitotic divsion. This cell contained 18 chromosomes. Some time later, the student obsered the resulting two cells and noted that one cell contained 19 chromosomes and the other contained 17 chromosomes. Apprently, a malfunction had occurred during the mitotic process. Which of the following is the most likely explanation of this malfunction?

a. Cytokinesis failed to occur at the end of telophase
b. Two of the chromosomes failed to line up in metaphase.
c. Metaphase preceded anaphase ini this cell division.
d. In one chromosome, the chromatids failed to seperate in anaphase
e. The spindle apparatus on one side of the cell was not functional.

please and thank you. dont guess :)
 
Hey Dude! Great Question!

The answer is D (In one chromosome...) purely because this entails that sister chromatids did not separate from the centromere at some point, and therefore result in one metaphase chromosome.

A (Cytokinesis...) - This is not correct because if cytokinesis failed to occur, the student would not have observed two cells; they would have observed one large one.

B - This is not correct because chromatids separate in mitosis. If two chromosomes failed to line up during metaphase, a total of four chromatids (chromosomes) would be missing in action.

C - This is not correct because metaphase DOES go before anaphase.

E - This is not correct because if the spindle appartus was not functional on one side, the chromatids would not have separated and the total chromosome number from both daughter cells would be 18.

Cheers!
 
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