Mitosis ensures identical genetic copies in daughter cells

Steps:

• Identify key mitosis features: 1) DNA replication produces identical copies; 2) spindle fibers attach to centromeres for equal separation; 3) sister chromatids divide equally to each pole.
• Evaluate how each maintains genetic composition: replication duplicates genome exactly; separation distributes copies evenly; no recombination preserves original alleles.
• Check choices: A includes all three essential processes; others omit at least one.
• Confirm A as complete set for genetic stability.

Why A is correct:

• Mitosis definition requires all three—replication, precise segregation via spindles, and chromatid separation—to produce genetically identical daughters per cell theory.

Why the others are wrong:

• B omits feature 2, ignoring spindle role in equal distribution.
• C includes only 1, neglecting segregation and division steps.
• D excludes 1, skipping initial duplication needed for identical genomes.

Final answer: A