Pattern 1: DNA Content Questions (Very High Frequency)

Common question format: "A cell at [phase] has DNA content of..." Most commonly tested stages:

• G2 phase = 4C (most frequently asked)
• After S phase = 4C DNA but STILL 2n chromosomes
• After meiosis I = 2C, n
• After meiosis II = 1C, n

NEET 2017 style question: "The G2 phase of a cell has 4C DNA. What is the chromosome number if 2n = 6?" Answer: 6 (not 12) — DNA doubled but not chromosomes.

Pattern 2: Prophase I Substage Identification (High Frequency)

Most commonly asked:

1. Where does crossing over occur? → Pachytene
2. When do chiasmata become visible? → Diplotene
3. When does synapsis occur? → Zygotene
4. What is the sequence of substages? → LZPDD

Most common wrong answers students choose:

• Crossing over → students say "Zygotene" (confusion with synapsis)
• Chiasmata visible → students say "Pachytene" (confusion with where exchange occurs)

Pattern 3: Mitosis vs. Meiosis Comparisons

Frequently tested in NEET:

• "Which is reductional division?" → Meiosis I
• "How many daughter cells in meiosis?" → 4 haploid
• "What separates in anaphase I?" → Homologous chromosomes (NOT sister chromatids)
• "Where does mitosis occur?" → Somatic cells
• "Where does meiosis occur?" → Germ cells in gonads

Pattern 4: G0 Phase Questions

Typical NEET question: "Which cells do not divide?" Answer: Neurons, mature RBCs, cardiac muscle cells (G0 phase)

High-Yield Summary for Last-Minute Revision