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The  two structures make up a single replicated chromosome is sister chromatids.The term 'sister chromatid' only applies when the identical copies are closely associated with one another and held together by a centromere. 
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After replication, two copies of DNA carrying the same genetic information get together in the same chromosome. These copies are known as sister chromatids.

Structure of a single replicated chromosome

During replication, DNA duplicates rising two copies of the molecule.

The two copies of the molecule carry the same genetic information.  

During the prophase, genetic material condensates. Each chromosome is now composed of two chromatids.

Each chromatid is a copy of the original chromosome.

These two strands keep joined together by a centromere.

So, the mitotic or meiotic chromosome is composed of  two sister chromatids- condensed and joined by the centromere. It looks X-shaped.  

You can learn more about chromatid sisters at

https://brainly.com/question/1574880

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