In multicellular eukaryotes, mitosis primarily occurs in which type of cell?

• A. Prokaryotic cells (bacteria and archaea)
• B. Gametes (sperm or egg cells)
• C. Only haploid sex cells during fertilization
• D. Somatic (body) cells

Answer: (D)

Verified step by step guidance

1. Understand the definition of mitosis: it is a process of cell division that results in two genetically identical daughter cells, maintaining the same chromosome number as the original cell.
2. Recall that mitosis occurs in eukaryotic cells, which have a defined nucleus, unlike prokaryotic cells (bacteria and archaea) that divide by binary fission, not mitosis.
3. Identify the types of cells in multicellular eukaryotes: somatic (body) cells and gametes (sex cells). Gametes are produced by meiosis, not mitosis.
4. Recognize that mitosis is responsible for growth, tissue repair, and maintenance in the organism, functions carried out by somatic cells.
5. Conclude that mitosis primarily occurs in somatic cells, as these cells divide to produce identical copies for the organism's development and upkeep.