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A medical student is studying how DNA is replicated. She radioactively labels the phosphate backbone of the genomic DNA in a mammalian fibroblast cell line. The student separates the cells after each round of cell division.

Assuming each cell gives rise to two daughter cells, how many cells would contain the radioactive signal after two rounds of cell division (F2 generation)?

A

$\cfrac{1}{4}$

B

$\cfrac{2}{4}$

C

$\cfrac{3}{4}$

D

$\cfrac{4}{4}$

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