Assertion (A): DNA replication must occur before mitosis begins.
Reason (R): DNA replication ensures each daughter cell receives a full set of genetic material.

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A Both (A) and (R) are true and (R) explains (A).
B Both (A) and (R) are true but (R) does not explain (A).
C (A) is true but (R) is false.
D (A) is false but (R) is true.

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Answer: A. Both (A) and (R) are true and (R) explains (A).

Assertion (A) is true: DNA copies itself during interphase before mitosis starts.
Reason (R) is true: Replication duplicates the genetic material.
The Connection: This duplication ensures both daughter cells get a full set of DNA.

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Assertion (A): DNA replication must occur before mitosis begins. Reason (R): DNA replication ensures each daughter cell receives a full set of genetic material.

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Assertion (A): DNA replication must occur before mitosis begins.
Reason (R): DNA replication ensures each daughter cell receives a full set of genetic material.