Most Frequently Tested Topics (Ranked by NEET Appearance)

Rank 1 — Homologous vs Analogous (appears almost every year):

• Bat wing vs butterfly wing = ANALOGOUS (most tested pair)
• Bat wing vs bird wing = HOMOLOGOUS (most common trap)
• Any mammalian forelimb comparison = HOMOLOGOUS
• Vertebrate vs invertebrate same function = ANALOGOUS

Rank 2 — Hardy-Weinberg Calculation:

• Almost always: given $q^{2}$ (recessive phenotype %) → find q → find p → find 2pq or $p^{2}$
• Always verify: $p^{2}$ + 2pq + $q^{2}$ = 1.00 (check arithmetic)

Rank 3 — Miller-Urey Experiment:

• Gases: CH4, NH3, H2, H2O (no O2)
• Energy: electric discharge
• Products: amino acids (glycine, alanine)

Rank 4 — Human Evolution Sequence:

• D-R-A-H-E-S order
• Australopithecus = first biped; Homo habilis = first tools

Rank 5 — Types of Natural Selection:

• Stabilizing = reduces variation (birth weight)
• Directional = shifts mean (industrial melanism)
• Disruptive = splits population (may cause speciation)

Most Common Trap Answer Patterns

1. "Homologous organs showing convergent evolution" — IMPOSSIBLE by definition; homologous = divergent
2. "Small isolated population maintains H-W equilibrium" — WRONG; small population = genetic drift
3. "Mutations at constant rate = equilibrium maintained" — WRONG; any mutation = violation
4. "Homo habilis was first biped" — WRONG; Australopithecus was first biped

NEET Answer Verification Rules

• Homologous + divergent = always paired together
• Analogous + convergent = always paired together
• Never mix these pairings in any answer