Answer :
Two sister chromatids are a pair of identical chromatids that combine together to form one single chromosome.
Chromatids are the equal and identical half of a single chromosome. They are genetically identical, this means that they contain the same genes that also reside in the same location. These chromatids are connected at the constricted regions known as centromeres.
Chromosomes are highly packed forms of DNA. It consists of DNA and histone proteins. Histone proteins play an important role in the formation of chromosomes. Each chromosome has two identical copies called sister chromatids that are attached to each other at the centromere. The ends of sister chromatids are called telomeres.
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