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# If one of the effects of a genetic mutation makes a

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Manager
Joined: 20 Aug 2017
Posts: 114
Re: If one of the effects of a genetic mutation makes a  [#permalink]

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01 Aug 2019, 07:39
If one of the effects of a genetic mutation makes a substantial contribution to the survival of the species, then, and only then, will that mutation be favored in natural selection. This process is subject to one proviso, namely that the traits that were not favored, yet were carried along by a trait that was favored, must not be so negative as to annul the benefits of having the new, favored trait.

If the statements above are true, each of the following could be true EXCEPT:

We need to take care that the question stem says COULD BE TRUE and NOT must be true.

(A) A species possesses a trait whose effects are all neutral for the survival of that species.

(B) All the effects of some genetic mutations contribute substantially to the survival of a species.

(C) A species possesses a trait that reduces the species’ survival potential.

(D) A genetic mutation that carries along several negative traits is favored in natural selection.

(E) A genetic mutation whose effects are all neutral to a species is favored in natural selection.
----> this is the only option that is not in line with what is stated in the argument. As the argument states that a genetic mutation will only be favored in natural selection when it makes a significant contribution. If effects are all neutral then it will not be favored in natural selection.
Manager
Joined: 10 Jun 2019
Posts: 123
Re: If one of the effects of a genetic mutation makes a  [#permalink]

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02 Aug 2019, 02:32
For could be true except questions the wrong answer will be that which directly opposes the stimulus. Any answer that is not supported by the stimulus in at all could be true and is thus wrong. The correct answer will directly oppose the stimulus making it impossible that it could be true

Only E fits this
Re: If one of the effects of a genetic mutation makes a   [#permalink] 02 Aug 2019, 02:32

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