centromere
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The point of attatchment between two chromatids is called the centromere. When two chromatids are connected, it is called a chromosome which is essential in DNA replication, or, mitosis.
Double cone is two cones joined at their apex.
Two pairs of chromatids lying side by side are referred to as a tetrad.
The common point is called the intersection.
If two sides meet at a POINT then it is a vertex or corner.