1
Artificial selection to obtain cows yielding higher milk output represents :
- directional as it pushes the mean of the character in one direction
- stabilizing followed by disruptive as it stabilizes the population to produce higher yielding cows.
- disruptive as it splits the population into two, one yielding higher output and the other lower output.
- stabilizing selection as it stabilizes this character in the population.
Answer
(1) directional as it pushes the mean of the character in one direction
Solution
As per NCERT, natural selection can lead to stabilisation (more individuals acquire the mean character value), directional change (more individuals acquire a value other than the mean) or disruption (more individuals acquire peripheral values at both ends).
In selecting cows for higher milk yield, only the individuals at one extreme (high yield) are chosen for breeding generation after generation.
The mean milk yield of the population shifts towards higher values.
It is directional selection.
Answer: (1)
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