NEET 2019 · BiologyPrevious Year Question
In a species, the weight of newborn ranges from 2 to 5 kg. 97% of the newborn with an average weight between 3 to 3.3 kg survive whereas 99% of the infants born with weight from 2 to 2.5 kg or 4.5 to 5 kg die. Which type of selection process is taking place?
Answer: (B) Stabilizing Selection. Answer: (B) Stabilizing Selection.
- A.Directional Selection
- B.Stabilizing Selection✓
- C.Disruptive Selection
- D.Cyclical Selection
Correct Answer
(B) Stabilizing Selection
Solution & Explanation
Answer: (B) Stabilizing Selection. Newborns of average weight (3–3.3 kg) survive at a high rate while those at both extremes (very low 2–2.5 kg or very high 4.5–5 kg) die. Selection favouring the mean character value and eliminating both extremes is stabilising selection. This is distinct from directional (favours one extreme) and disruptive (favours both extremes) selection. NCERT Reference: Ch 6 Evolution, p.121, lines 34–35: "stabilisation (in which more individuals acquire mean character value)".
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