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Natural selection tends to eliminate genes that cause inheri

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Manager
Joined: 09 Jan 2020
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Natural selection tends to eliminate genes that cause inheri [#permalink]  13 Feb 2020, 23:39
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Question Stats:

84% (00:50) correct 15% (01:13) wrong based on 58 sessions
Natural selection tends to eliminate genes that cause inherited diseases, acting most strongly against the most severe diseases; consequently, hereditary diseases that are----would be expected to be very----, but, surprisingly, they are not.
(A) lethal.. rare
(B) untreated.. dangerous
(C) unusual.. refractory
(D) new.. perplexing
[Reveal] Spoiler: OA
Manager
Joined: 09 Jan 2020
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Kudos [?]: 14 [0], given: 79

Re: Natural selection tends to eliminate genes that cause inheri [#permalink]  13 Feb 2020, 23:40
Please explain why B, C, D wrong and A right. What is your thought process?
Manager
Joined: 20 Jun 2019
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GRE 1: Q158 V162
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Re: Natural selection tends to eliminate genes that cause inheri [#permalink]  14 Feb 2020, 03:32
"Natural selection tends to eliminate genes that cause inherited diseases, acting most strongly against the most severe diseases; consequently, hereditary diseases that are----would be expected to be very----, but, surprisingly, they are not."

Meaning: Based on this logic natural selection would eliminate the deadly hereditary diseases but surprisingly this is not the case.

A- Lethal and rare are the correct combination. The diseases are lethal and due to what we are told about natural selection it's surprising that these diseases are not rare.
B- Untreated doesn't work since there's no context associated with this word. Also the diseases are dangerous so not dangerous would be an opposite.
C- Unusual diseases are not the perogative of the argument here. Refractory means stubborn and that too doesn't make sense with the rest of the sentence.
D- New and perplexing (puzzling) are illogical against the given information about natural selection.
E- Same as D, there is no basis for this and the natural selection information.
Manager
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Re: Natural selection tends to eliminate genes that cause inheri [#permalink]  16 Feb 2020, 19:35
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pprakash786 wrote:
"Natural selection tends to eliminate genes that cause inherited diseases, acting most strongly against the most severe diseases; consequently, hereditary diseases that are----would be expected to be very----, but, surprisingly, they are not."

Meaning: Based on this logic natural selection would eliminate the deadly hereditary diseases but surprisingly this is not the case.

Great explanation, thank you for including your way of understanding here. It helps me understand too
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Re: Natural selection tends to eliminate genes that cause inheri [#permalink]  31 Mar 2020, 23:23
Natural selection tends to eliminate genes that cause inherited diseases, acting most strongly against the most severe diseases; consequently, hereditary diseases that are----would be expected to be very----, but, surprisingly, they are not.

The word "consequently" forces us to follow the logical conclusion of the sentence fragment before the comma or "consequently".

viz

Natural selection tends to eliminate genes that cause inherited diseases, acting most strongly against the most severe diseases.

Therefore we can conclude, hereditary diseases that are lethal (severe diseases) would be expected to be very rare (eliminate genes,acting most strongly).

Therefore A is the correct answer.

The fragment, "but, surprisingly, they are not" is verbiage here and meant to distract the reader.
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Re: Natural selection tends to eliminate genes that cause inheri   [#permalink] 31 Mar 2020, 23:23
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