Assertion:The cycle's prophase, which occurs immediately after the S and G2 phases, is characterised by the condensation of the genetic material.
Reason: For the purpose of creating compact mitotic chromosomes, which are made up of two chromatids joined at the centromere.
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Both Assertion & Reason are true and the reason is the correct explanation of the assertion.
The cycle's prophase, which comes just after the S and G2 phases, is characterised by the condensing of the genetic material into compact mitotic chromosomes made of two chromatids joined at the centromere. The start of the construction of the mitotic spindle, the microtubules, and the proteinaceous cytoplasmic elements that aid in the process marks the end of the prophase.
Option 1 is the correct answer.