Multiple Choice
The phase of the ovarian cycle that extends from ovulation to the start of menstruation is the:
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11. Cell Division
Introduction to the Cell Cycle
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In which stage of the cell cycle do chromosomes replicate to form identical copies of themselves?
A
M phase
B
G1 phase
C
G2 phase
D
S phase
Verified step by step guidance1
Understand the cell cycle: The cell cycle consists of several stages, including G1 (Gap 1), S (Synthesis), G2 (Gap 2), and M (Mitosis). Each stage has a specific role in cell growth and division.
Focus on the S phase: The S phase, or Synthesis phase, is the part of the cell cycle where DNA replication occurs. During this phase, each chromosome is duplicated to form two identical sister chromatids.
Differentiate the other phases: G1 phase is primarily for cell growth and preparation for DNA replication. G2 phase is for further growth and preparation for mitosis. M phase is where the cell divides into two daughter cells.
Relate the question to the S phase: Since the question asks about the stage where chromosomes replicate to form identical copies, this directly corresponds to the S phase of the cell cycle.
Conclude that the correct answer is the S phase, as this is the only stage where DNA replication and chromosome duplication occur.
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