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(B) Stabilizing selection is a type of natural selection in which the population mean stabilizes on a particular non-extreme trait value.In this case,

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Stabilizing Selection

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(B) Stabilizing selection is a type of natural selection in which the population mean stabilizes on a particular non-extreme trait value.In this case,the newborns with an average weight ($3$ to $3.3 \; kg$) have a high survival rate $(97 \%)$,while those with extreme weights (very low: $2$ to $2.5 \; kg$ or very high: $4.5$ to $5 \; kg$) have a very high mortality rate $(99 \%)$.Since the selection process favors the intermediate phenotype and eliminates the extreme phenotypes,it is known as Stabilizing Selection.

In a species,the weight of newborn ranges from $2$ to $5 \; kg$. $97 \%$ of the newborns 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?

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