In a species, the weight of newborn ranges form 2to 5kg. 97 % of the newborn with an average weight between 3to 3.3 kg survive whereas 99% of the infants born with weights from 2to 2.5 or 4.5 to 5kg die. Which type of selection process is taking place?
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a
Cyclical selection
b
Directional selection
c
Stabilising selection
d
Disruptive selection
answer is C.
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Detailed Solution
Since more individuals (97%) acquire mean character value (3 to 3.3 kg), the type of selection taking place is normalising (stabilising) natural selection.
In a species, the weight of newborn ranges form 2to 5kg. 97 % of the newborn with an average weight between 3to 3.3 kg survive whereas 99% of the infants born with weights from 2to 2.5 or 4.5 to 5kg die. Which type of selection process is taking place?