Multiple Choice
At what stage of embryogenesis do the three germ layers (ectoderm, mesoderm, and endoderm) form?
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11. Cell Division
Introduction to Cell Division
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During which phase of mitosis does DNA replication occur?
A
Prophase
B
None; DNA replication occurs during interphase, not mitosis.
C
Metaphase
D
Anaphase
Verified step by step guidance1
Understand the process of mitosis: Mitosis is the division of a cell's nucleus into two identical nuclei, and it consists of several phases: prophase, metaphase, anaphase, and telophase.
Clarify the role of DNA replication: DNA replication is the process by which a cell duplicates its DNA to ensure that each daughter cell receives a complete set of genetic material.
Identify when DNA replication occurs: DNA replication does not occur during mitosis. Instead, it happens during interphase, specifically in the S phase (synthesis phase) of the cell cycle, which precedes mitosis.
Review the phases of mitosis: Prophase, metaphase, anaphase, and telophase are the stages of mitosis, but none of these involve DNA replication. These phases focus on the separation and distribution of already replicated chromosomes.
Conclude that DNA replication occurs during interphase, not during any phase of mitosis, and ensure understanding of the distinction between interphase and mitosis in the cell cycle.
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