Assertion: Synthesis of DNA takes place in the S. phase of interphase.
Reason: Every chromosme, during metaphase, has two chromatids.

Options

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C. If the assertion is true but the reason is false
D. If both the assertion and reason are false

Answer

B

Explanation

Synthesis DNA occurs is s phase of cell cycle in which DNA content get double but chromosome during metaphase the chromosome aligned at metaphase or equatorial plate and each chromosome consist of two chromatids joined by a centromere.