Question

a researcher observes cells that begin as diploid (2n) and end up as two diploid (2n) cells. the primary role of this process in the life of the organism is to: halt the cell cycle to prevent tumor formation. produce genetically diverse gametes for reproduction. ensure the production of haploid cells for genetic recombination. promote asexual reproduction, growth, and tissue repair. which statement correctly identifies a unique functional outcome of meiosis compared to mitosis in eukaryotes? meiosis results in cells that are genetically identical to the parent cell. meiosis ensures the rapid production of identical somatic cells. meiosis is the only way to replace damaged or old tissue cells. meiosis reduces the chromosome number by half.

Explanation:

• First question:
• Mitosis is the process described (begin as diploid \(2n\) and end as two diploid \(2n\) cells).
• Mitosis is crucial for asexual reproduction (in some organisms), growth (increasing cell number for body expansion), and tissue repair (replacing damaged cells).
• Halting the cell cycle to prevent tumor formation is not the primary role of mitosis. Producing genetically diverse gametes is for meiosis (not mitosis). Ensuring haploid cells is also a meiosis function (gamete formation).
• Second question:
• Mitosis results in cells genetically identical to the parent cell. Meiosis has genetic recombination (crossing - over) and independent assortment, so its cells are not genetically identical to the parent.
• Rapid production of identical somatic cells is a mitosis function. Replacing damaged or old tissue cells is mitosis.
• Meiosis reduces the chromosome number from diploid (\(2n\)) to haploid (\(n\)) (e.g., in gamete formation in sexually - reproducing organisms), which is a unique functional outcome compared to mitosis (which maintains the diploid chromosome number in somatic cells).

Answer:

• First question: Promote asexual reproduction, growth, and tissue repair.
• Second question: Meiosis reduces the chromosome number by half.