In mitosis, what is the term for the two sets of identical chromatids formed in the parent cell before they are separated into daughter cells?

• A. Sister chromatids
• B. Homologous chromosomes
• C. Centromeres
• D. Tetrads

Answer: (A)

Verified step by step guidance

1. Understand the context of the question: Mitosis is the process of cell division where a single cell divides into two genetically identical daughter cells. During this process, DNA is replicated, and the replicated DNA is organized into structures called chromatids.
2. Define the key terms: Sister chromatids are identical copies of a single chromosome that are connected by a centromere. Homologous chromosomes, on the other hand, are pairs of chromosomes (one from each parent) that are similar but not identical. Centromeres are the regions where sister chromatids are joined, and tetrads are structures formed during meiosis, not mitosis.
3. Focus on the phase of mitosis: Before the chromatids are separated into daughter cells, they exist as pairs of identical chromatids connected at the centromere. These are specifically referred to as sister chromatids.
4. Eliminate incorrect options: Homologous chromosomes are not identical and are relevant to meiosis, not mitosis. Centromeres are part of the structure but not the term for the chromatids themselves. Tetrads are also specific to meiosis and do not occur in mitosis.
5. Conclude that the correct term for the two sets of identical chromatids formed in the parent cell before separation is 'sister chromatids.'