Two identical halves of a replicated chromosome are called

• A. Chromatids
• B. Centromere
• C. Chromosome
• D. Nucleus

Answer: (A)

The concept here is how genetic material is organized after DNA replication. After replication, each chromosome contains two identical copies that are joined together. Those two identical copies are called chromatids, specifically sister chromatids, because they belong to the same replicated chromosome. They stay connected at the centromere and are later separated during mitosis to form two separate chromosomes in daughter cells. The centromere is the region that holds the chromatids together and serves as the attachment point for spindle fibers; it isn’t describing the halves themselves. The nucleus is the organelle that houses DNA, not the structure of the replicated chromosome. So, the two identical halves are chromatids.