Evolution practice focused on evidence, mechanisms, population genetics, speciation and human evolution. Every preview below comes from NeetVellum's live original bank—not an unverified PYQ reconstruction.
evidence, mechanisms, population genetics, speciation and human evolution.
Original practice preview
These are current-syllabus NeetVellum questions, shown separately from historical-paper provenance.
Example 1 · difficulty 1/5
In his 1953 spark-discharge experiment simulating conditions on primitive Earth, Stanley Miller passed electric discharge through a sealed gaseous mixture held at about 800°C. Which combination of gases did he use?
A. Methane, ammonia, hydrogen and water vapour
B. Carbon dioxide, nitrogen, oxygen and water vapour
C. Methane, oxygen, hydrogen sulphide and water vapour
D. Ammonia, nitrogen, carbon dioxide and ozone
Example 2 · difficulty 2/5
In a large randomly mating population at Hardy–Weinberg equilibrium, 16% of individuals express a recessive trait. The expected frequency of heterozygous carriers in this population is:
A. 0.16
B. 0.48
C. 0.36
D. 0.24
Example 3 · difficulty 3/5
In human populations, newborns with birth weights much lower or much higher than the average show increased infant mortality, while babies near the mean survive best. Over generations this keeps the mean birth weight unchanged. This pattern of selection is called:
A. Stabilising selection
B. Directional selection
C. Disruptive selection
D. Genetic drift
The evidence-first practice loop
1. Verify provenanceOfficial paper and final key before accepting a PYQ label.
2. Attempt closed-bookExpose the concept or execution gap before rereading.
3. Repair and returnClassify the miss and re-practice after a delay.