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after dna replication during s phase of interphase, each chromosome has a copy and the cell is now 4n. we call these identical pairs and they are held together by a

a. homologous pairs; centrosome.
b. sister chromatids; histone.
c. homologous pairs; histone.
d. sister chromatids; centromere.

The correct answer is D sister chromatids;centromere

Explanation:

After DNA replication during s phase or synthesis phase of interphase of the cell cycle,each chromosome has a copy and the cell that is newly formed is now 4n.

      We cal these identical pairs sister chromatids and they are held together by a centromere

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