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 weights from 2 to 2.5 kg or 4.5 to 5 kg die. Which type of selection process is taking place ?
Darwin and modern synthetic theory
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NEET UG 2019 question paper (official, booklet P1)
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Variations caused by mutation, as proposed by Hugo de Vries, are :