A biologist measured the amount of DNA in several single diploid cells taken from a culture. He knew that these cells could divide mitotically, but not meiotically. His data is shown below: Cell Number and DNA content in micrograms: Cell 1 (11.1 micrograms) Cell 2 (5.4 micrograms) Cell 3 (7.3 micrograms) Cell 4 ( 10.9 micrograms) Cell 5 (5.6 micrograms) Cell 6 (8.6 micrograms) Cell 7 (11.0 micrograms) Which of these cells have most likely just completed mitosis and cytokinesis?

To determine which of the cells have most likely just completed mitosis and cytokinesis, we need to analyze the changes in DNA content.

During mitosis and cytokinesis, a cell duplicates its genetic material and then divides into two daughter cells. The DNA content in each daughter cell should be the same as the parental cell before division.

Looking at the data provided:
Cell 1: 11.1 micrograms
Cell 2: 5.4 micrograms
Cell 3: 7.3 micrograms
Cell 4: 10.9 micrograms
Cell 5: 5.6 micrograms
Cell 6: 8.6 micrograms
Cell 7: 11.0 micrograms

We observe that Cell 1 and Cell 7 have DNA contents of 11.1 micrograms and 11.0 micrograms, respectively. This suggests that these cells have the same DNA content as the parental cell and have likely just completed mitosis and cytokinesis.

Therefore, Cell 1 and Cell 7 are the cells most likely to have just completed mitosis and cytokinesis.