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Re: If one of the effects of a genetic mutation makes a [#permalink]
01 Aug 2014, 06:13
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If one of the effects of a genetic mutation makes a [#permalink]
25 Jan 2016, 14:01
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 basically need to understand that a genetic mutation is made up of one or more traits or effects creating a "NET EFFECT" (A) A species possesses a trait whose effects are all neutral for the survival of that species. A trait whose effects are neutral may be carried forward by a positive trait creating net positive effect. Hence, could be true. (B) All the effects of some genetic mutations contribute substantially to the survival of a species. A mutation with several traits all of which contribute substantially will have a net positive effect. Hence, could be true. (C) A species possesses a trait that reduces the species’ survival potential.One of the several traits could have a negative effect but it could be outweighed and the net effect could still be positive.Hence, could be true. (D) A genetic mutation that carries along several negative traits is favored in natural selection.Again, the net effect could still be positive despite many negative traits. Hence, could be true (E) A genetic mutation whose effects are all neutral to a species is favored in natural selection. If all the traits(or "effects") in a mutation are neutral the net effect is neutral meaning it doesn't contribute to survival so it cannot be favoured.
If one of the effects of a genetic mutation makes a
25 Jan 2016, 14:01