Stabilizing selection/Balancing selection.

Question

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Answer

Stabilizing selection is the type of natural selection which balances the population, hence it is also known as balancing selection.
In such population more individuals acquire a mean character value.
Such selection tends to favour the intermediate forms and eliminate both the phenotypic extremes.
E.g. More number of infants with intermediate weight survive better as compared to overweight or underweight infants.
Stabilizing selection reduces variations.
It tends to maintain phenotypic stability within population, and does not bring about drastic evolutionary changes.
A population showing stabilizing selection is well-adapted to its environment.

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Complete the following table:

Blood vessel	Functions
(1) Pulmonary aorta	(a) Carries oxygenated blood to left atrium
(2) Superior vena cava	(b) Carries oxygenated blood to all body parts
(3) Pulmonary vein	(c) Carries deoxygenated blood from upper parts of body to right atrium
(4) Aorta	(d) Carries deoxygenated blood to lungs