Why does natural selection not instantly create a new trait according to an organism's need?
Answer and explanation
Correct answer: Because selection acts on already existing variations
The governing concept is natural selection acting on heritable variation. A population already contains differences produced by genetic variation. If an existing difference helps survival or reproduction, individuals carrying it may leave more offspring, so that trait can become more common over generations. Selection changes the frequency of available traits; it does not consciously design or instantly manufacture a trait because an organism needs it. Therefore option A is correct, while B and C are meaningless and D expresses the rejected idea of instant change by need.
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What is the correct answer to this question?
Because selection acts on already existing variations
Why is this the correct answer?
The governing concept is natural selection acting on heritable variation. A population already contains differences produced by genetic variation. If an existing difference helps survival or reproduction, individuals carrying it may leave more offspring, so that trait can become more common over generations. Selection changes the frequency of available traits; it does not consciously design or instantly manufacture a trait because an organism needs it. Therefore option A is correct, while B and C are meaningless and D expresses the rejected idea of instant change by need.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Heredity and Evolution.
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