[Nicolas Sanchez]

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A sample of healthy human cells contains 4 cells. After they were allowed to divide 5 times using the same type of cell division, there were 128 cells in the sample.
Assuming that no mutations occur, which two of the following statements are correct?

1 All the cells would have the same number of chromosomes.
2 The cells were gametes.
3 The cells would be clones of the original cells.
4 This type of cell division is called meiosis.
A. 1 and 2 only
B. 1 and 3 only
C. 1 and 4 only
D. 2 and 3 only
E. 2 and 4 only
F. 3 and 4 only

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Discussion

[Paris]

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First we have to determine whether the underwent mitosis or meiosis. We do this by seeing which process will give 128 cells after it happens 5 times. In the case of mitosis we have 4 cells then 8 then 16 then 32 then 64 and then 128. So we have mitosis. Therefore, the cells created are identical to the initial cells and statements 1 and 3 are correct.

The answer is B.