Here's a breakdown:
* Chromosomes: These are long, thread-like structures found in the nucleus of cells that carry genetic information.
* Before Replication: A chromosome is made up of a single, long molecule of DNA.
* During Replication: The DNA molecule replicates, creating two identical copies of itself. These copies remain attached to each other at a point called the centromere.
* After Replication: Each copy of the DNA molecule is now called a chromatid. The two chromatids are joined at the centromere, forming a duplicated chromosome.
Therefore, the sides of a chromosome after they are in structure are called chromatids.
