Question

students are presented with the cell cycle model below and asked to describe each lettered portion.
what is portion a of the model showing and what is its purpose?
a portion a of the model shows mitosis, which creates four genetically identical cells.
b portion a of the model shows dna being copied, which is required before mitosis to create two genetically identical cells.
c portion a of the model shows mitosis, which creates two genetically different cells.
d portion a of the model shows dna replication, which is required before mitosis to create two genetically different cells.

Explanation:

• Mitosis creates two genetically identical cells. So options B (creates four cells) and D (creates different cells) are wrong.
• Portion A shows DNA replication (chromosomes going from single - stranded to double - stranded). DNA replication is required before mitosis. Option A says it is mitosis, which is incorrect.

Answer:

C. Portion A of the model shows DNA being copied, which is required before mitosis to create two genetically identical cells.