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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.

D. sister chromatids; centromere

Explanation:

Chromosomes are made up of two filaments joined by the centromere. Each of these filaments is called a chromatid. The two chromatids found on a duplicated chromosome (duplication occurs during the interphase in cell division) are called sister chromatids. In the process of cell division, they separate, each going to a daughter cell.

In other words, we can say that after DNA replication during the S phase of the interphase, each chromosome has a copy and the cell is now 4n. We call these identical pairs of sister chromatids and they are held together by a centromere.

[ answer ]

foliated

[ explanation ]

foliation forms in a rock when pressure squeezes the rock together. the rock then has a design of many different color little lines. there are three types of foliated rock. the types are slate, schist, and gneiss. each type of foliated rock is different based on grain size and foliation characteristics. the lines appear when the rock has been under pressure.

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the unequal cytoplasmic division that  results  in  one egg  and three polar bodies ensures that a fertilized  egg has  ample nutrients  forits journey  to  the uterus.