Question

Cells that have bound a fluorescent dye to their DNA can be sorted by FACS (fluorescent activated cell sorting) and counted. The results of such an experiment is shown in the figure below. The cells comprising fraction "A" would be expected to be in:

a. G1
b. S
c. G2
d. M
e. none of the above

Answer 1

Cells comprising fraction A in the FACS experiment would be expected to be in the G1 phase of the cell cycle.

Step-by-step explanation:

Fluorescence-activated cell sorting (FACS) is a technique used to separate cells based on their fluorescence intensity. In this case, cells that have bound a fluorescent dye to their DNA are being sorted. The graph provided shows the results of the experiment, with different fractions labeled A, B, C, and D. Based on the figure, cells comprising fraction A would be expected to be in the G1 phase of the cell cycle, where DNA is not actively being replicated.