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In a species, the weight of a 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 weights from 2 to 2.5 o r 4.5 to 5 kg die. Which type of selection process is taking place?    [NEET 2019]
  • a)
    Cyclical selection
  • b)
    Directional selection
  • c)
    Stabilising selection
  • d)
    Disruptive Selection
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
In a species, the weight of a newborn ranges from 2 to 5 kg. 97% of th...
Stabilising selection is a balancing type of natural selection that favours average-sized individuals and eliminates extreme individuals.
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In a species, the weight of a newborn ranges from 2 to 5 kg. 97% of th...
Explanation:

Stabilizing selection is a type of natural selection in which the population mean stabilizes on a particular non-extreme trait value. This occurs when the environment is stable and consistent, and selection pressures eliminate individuals on the extremes of the trait distribution.

In this scenario, the weight of a newborn ranges from 2 to 5 kg, with a survival rate that varies based on the weight. The survival rate is highest for newborns with an average weight between 3 to 3.3 kg, which suggests that the population is stabilizing on this trait value.

Furthermore, the survival rate is much lower for newborns with weights from 2 to 2.5 kg or 4.5 to 5 kg, indicating that selection pressures are eliminating individuals on the extremes of the trait distribution.

Therefore, the type of selection process that is taking place in this scenario is stabilizing selection.
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In a species, the weight of a 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 weights from 2 to 2.5 o r 4.5 to 5 kg die. Which type of selection process is taking place? [NEET 2019]a)Cyclical selectionb)Directional selectionc)Stabilising selectiond)Disruptive SelectionCorrect answer is option 'C'. Can you explain this answer?
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