Question

When nutrients are low, cells of the budding yeast (Saccharomyces cerevisiae) exit the mitotic cell cycle and enter meiosis. Researchers grew a culture of yeast cells in a nutrient-rich medium and then transferred them to a nutrient-poor medium to induce meiosis. At different times after induction, the DNA content per cell was measured in a sample of the cells, and the average DNA content per cell was recorded in femtograms. A graph of the DNA amounts over time since the beginning of incubation, is below. About how many hours of incubation pass before cells begin the first round of cytokinesis I? Average amount of DNA per cell (fg) 55 - G1 S G2-MI MII 50 45 40 35 30 25 20 15 10 5 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Time after induction (hr) 1 hr 3 hrs 7 hrs 9.5 hrs

          When nutrients are low, cells of the budding yeast (Saccharomyces cerevisiae) exit the mitotic cell cycle and enter meiosis. Researchers grew a culture of yeast cells in a nutrient-rich medium and then transferred them to a nutrient-poor medium to induce meiosis. At different times after induction, the DNA content per cell was measured in a sample of the cells, and the average DNA content per cell was recorded in femtograms. A graph of the DNA amounts over time since the beginning of incubation, is below. About how many hours of incubation pass before cells begin the first round of cytokinesis I?

Average amount of DNA per cell (fg)
55 - G1 S G2-MI MII
50
45
40
35
30
25
20
15
10
5
0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
Time after induction (hr)

1 hr
3 hrs
7 hrs
9.5 hrs

When nutrients are low, cells of the budding yeast (Saccharomyces cerevisiae) exit the mitotic cell cycle and enter meiosis. Researchers grew a culture of yeast cells in a nutrient-rich medium and then transferred them to a nutrient-poor medium to induce meiosis. At different times after induction, the DNA content per cell was measured in a sample of the cells, and the average DNA content per cell was recorded in femtograms. A graph of the DNA amounts over time since the beginning of incubation, is below. About how many hours of incubation pass before cells begin the first round of cytokinesis I?

Average amount of DNA per cell (fg)
55 - G1 S G2-MI MII
50
45
40
35
30
25
20
15
10
5
0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
Time after induction (hr)

1 hr
3 hrs
7 hrs
9.5 hrs

Added by Justin G.

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