In which phase of the eukaryotic cell cycle is the DNA in its most highly condensed form?Group of answer choicesS phaseG1 phaseM phaseG2 phase

Break Down the Problem

1. Identify the phases of the eukaryotic cell cycle:
   • S phase
   • G1 phase
   • M phase
   • G2 phase
2. Determine the characteristics of each phase with respect to DNA condensation.

Relevant Concepts

• Cell Cycle Phases:
  • G1 phase: The cell grows and carries out normal functions; DNA is in its relaxed chromatin form.
  • S phase: DNA replication occurs; chromosomes are still in a less condensed form.
  • G2 phase: Prepares for mitosis; DNA begins to condense but is not yet at its most condensed state.
  • M phase: Mitosis occurs; DNA is in its most highly condensed form as chromosomes.

Analysis and Detail

• G1 Phase: DNA is loosely organized, allowing for gene expression and DNA repair.
• S Phase: Chromatin starts to condense slightly as DNA is replicated.
• G2 Phase: Cells prepare for mitosis; chromatin continues to condense but is still not maximally condensed.
• M Phase: During prophase, metaphase, anaphase, and telophase, chromatin is maximally condensed into distinct chromosomes, making it the phase with the most condensed DNA.

Verify and Summarize

The M phase, or mitosis, involves the most condensed form of DNA compared to other phases. The condensation allows for efficient separation of chromosomes during cell division.

Final Answer

The DNA is in its most highly condensed form during the M phase of the eukaryotic cell cycle.