Question

Before cell division of somatic cells, each chromosome must be replicated. After replication, the resulting two parts of each chromosome are held together by cohesin at the centromere. These two parts are referred to as:

a) Chromatids
b) Centrioles
c) Centromeres
d) Chromatin

Answer 1

After DNA replicates in the S phase of interphase, each chromosome consists of two identical copies called sister chromatids, held together at the centromere. The correct term for the two parts of each chromosome held together after replication is chromatids.

Step-by-step explanation:

Before cell division of somatic cells, each chromosome must be replicated. After replication, the resulting two parts of each chromosome are held together by cohesin at the centromere. These two parts are referred to as sister chromatids. During the S phase of interphase, DNA replication occurs, producing two identical copies of each chromosome, which are called sister chromatids. The sister chromatids are attached to one another at a region known as the centromere, which is highly condensed and appears as a constricted area under a light microscope. Cohesin proteins hold the chromatids together until they are eventually separated during mitosis or meiosis. Thus, the correct answer to the question is (a) Chromatids.