In the phases of mitosis, what structure is formed by two sister chromatids being held together by a centromere?

• A. Nucleolus
• B. Spindle fiber
• C. Chromosome
• D. Centrosome

Answer: (C)

Verified step by step guidance

1. Understand that mitosis is a process of cell division that results in two genetically identical daughter cells from a single parent cell.
2. Recognize that during mitosis, chromosomes are the structures that carry genetic information in the form of DNA.
3. Identify that each chromosome consists of two sister chromatids, which are identical copies of the chromosome's DNA.
4. Note that the sister chromatids are held together at a region called the centromere.
5. Conclude that the structure formed by two sister chromatids held together by a centromere is called a chromosome.