In a species,the weight of newborn ranges from 2 to 5 kg. 97% of the newborn with an average reight 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 ?

  • Option 1)

    Directional Selection

  • Option 2)

    Stabilizing Selection

  • Option 3)

    Disruptive Solution

  • Option 4)

    Cyclical Solution

Answers (4)

 

Stabilizing or balancing selection -

A type of natural detection which leads to the elimination of organism having over specialised characters and maintains homogeneous population which is generally constant. 

- wherein

It favours the average or normal phenotypes. Results in very low rate of evolution. 

 

 

 

Stabilizing selection favours the medium types (3 \; to\; 3.3\; kg) while the extreme phenotypes (2 \; to\; 2.5\; kg\; and\; 4.5\; to\; 5 \; kg) are eliminated.


Option 1)

Directional Selection

Option 2)

Stabilizing Selection

Option 3)

Disruptive Solution

Option 4)

Cyclical Solution

Directional selection

 

2 )stabilizing selection   will be the correct answer as in this case the mid characters are favoured not the extremes

Option 2

 

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