Chromatids are __________.

• A. found only in aberrant chromosomes
• B. held together by the centrioles
• C. the bacterial equivalent of eukaryotic chromosomes
• D. composed of RNA
• E. identical copies of each other if they are part of the same duplicated chromosome

Answer: (E)

Verified step by step guidance

1. Understand the definition of chromatids: Chromatids are one of the two identical halves of a duplicated chromosome. They are formed during the S phase of the cell cycle when DNA replication occurs.
2. Recognize the context in which chromatids exist: Chromatids are present during cell division, specifically in the stages of mitosis and meiosis, where they are crucial for the accurate segregation of genetic material.
3. Identify the relationship between chromatids: In a duplicated chromosome, chromatids are identical copies of each other, connected by a region called the centromere.
4. Clarify common misconceptions: Chromatids are not composed of RNA; they are made of DNA and associated proteins. They are not found only in aberrant chromosomes, nor are they held together by centrioles.
5. Relate chromatids to bacterial chromosomes: Bacteria have a single circular chromosome and do not form chromatids as eukaryotic cells do during cell division.