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# A severe illness which affects the red blood cell count has been found

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Retired Moderator
Joined: 29 Apr 2015
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A severe illness which affects the red blood cell count has been found  [#permalink]

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Updated on: 24 Sep 2018, 02:26
2
7
00:00

Difficulty:

55% (hard)

Question Stats:

60% (02:02) correct 40% (02:16) wrong based on 325 sessions

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A severe illness which affects the red blood cell count has been found to be hereditary. Fifty percent of those who are diagnosed with the illness have a parent who suffers from it. A known scientist has hypothesized that 50% of the children of carriers of the illness will also suffer from it at one point or another.

Which of the following, if true, would most weaken the conclusion drawn by the known scientist?

A. There are many diseases which are genetic, but few of them show a 100% chance of transferring to one's children.

B. Those suffering from the disease whose parents also suffer from it have, on average, one other sick sibling and three healthy siblings.

C. The illness, though serious, it treatable.

D. The average number of children per woman across the globe is less than 2.

E. If you have the illness, the chance that any specific grandchild of yours will suffer from it is 25 out of 100, considering no-one else in the grandchild's family has the disease.

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Originally posted by reto on 02 Sep 2015, 11:15.
Last edited by Bunuel on 24 Sep 2018, 02:26, edited 1 time in total.
Renamed the topic and edited the question.
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Re: A severe illness which affects the red blood cell count has been found  [#permalink]

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02 Sep 2015, 22:39
I feel its B too.

Btw, I didn't see the correct answer getting highlighted when I marked it as B. Does that mean my answer is wrong, or is the answer just not available yet?
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Re: A severe illness which affects the red blood cell count has been found  [#permalink]

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02 Sep 2015, 22:43
dee88 wrote:
I feel its B too.

Btw, I didn't see the correct answer getting highlighted when I marked it as B. Does that mean my answer is wrong, or is the answer just not available yet?

Hi Dee88,

Answer has not been released. It will be revealed at 12:15 PST today, as mentioned below the Question that OA will be released at 12:15 PST
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Re: A severe illness which affects the red blood cell count has been found  [#permalink]

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15 Sep 2015, 17:26
B correct
Conclusion: 50% of the children whose parents carry this disease will carry this disease as well.
Weaken: more than or less than 50% of children whose parents carry this disease will carry this disease as well.
B: if a child who carries this disease has 1 sick sibling and 3 healthy siblings, then the % of children whose parents carry this disease will also carry this disease is 2/5=40%, not 50%.
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Re: A severe illness which affects the red blood cell count has been found  [#permalink]

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Updated on: 17 Sep 2015, 04:29
1
A severe illness found to be hereditary.
Fifty percent of patients have a parent who suffers from it.
Assumptions
1. The past scenario will repeat in future
2. % of the children of carriers will neither be less than 50% nor more than 50%.

A known scientist has hypothesized that 50% of the children of carriers of the illness will also suffer from it at one point or another.

weaken the conclusion drawn by the known scientist?

A. There are many diseases which are genetic, but few of them show a 100% chance of transferring to one's children.
(We are not interested regarding other diseases. This scope is too broad. OFS)

B. Those suffering from the disease whose parents also suffer from it have, on average, one other sick sibling and three healthy siblings.
(This explains that the percentage of patients cannot 50% but less than that. This is inline with our assumption 2. Correct answer)

C. The illness, though serious, it treatable.
(It is not the matter of discussion whether the illness is treatable or not. We are bothered whether people continue to suffer or not)

D. The average number of children per woman across the globe is less than 2.
(no of children is OFS)

E. If you have the illness, the chance that any specific grandchild of yours will suffer from it is 25 out of 100, considering no-one else in the grandchild's family has the disease.
(This if not anything else strengthens the conclusion but cannot weaken it)

Originally posted by Nevernevergiveup on 16 Sep 2015, 08:28.
Last edited by Nevernevergiveup on 17 Sep 2015, 04:29, edited 2 times in total.
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Re: A severe illness which affects the red blood cell count has been found  [#permalink]

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17 Sep 2015, 04:11
Mechmeera wrote:
A severe illness found to be hereditary.
Fifty percent of patients have a parent who suffers from it.
Assumptions
1. The past scenario will repeat in future
2. % of the children of carriers will neither be less than 50% nor more than 50%.

A known scientist has hypothesized that 50% of the children of carriers of the illness will also suffer from it at one point or another.

weaken the conclusion drawn by the known scientist?

A. There are many diseases which are genetic, but few of them show a 100% chance of transferring to one's children.
(We are not interested regarding other diseases. This scope is too broad. OFS)

B. Those suffering from the disease whose parents also suffer from it have, on average, one other sick sibling and three healthy siblings.
(This explains that the percentage of patients cannot 50% but less than that. This is inline with our assumption 2. Correct answer)

C. The illness, though serious, it treatable.
(It is not the matter of discussion whether the illness is treatable or not. We are bothered whether people continue to suffer or not)

D. The average number of children per woman across the globe is less than 2.
(no of children is OFS)

E. If you have the illness, the chance that any specific grandchild of yours will suffer from it is 25 out of 100, considering no-one else in the grandchild's family has the disease.
(This if not anything strengthens the conclusion but cannot weaken it)

Hi Mechmeera

IMO option E doesn't affect conclusion in any way. Argument is concerned with the %age of sick children of an immediate generation while E talks about grandchildren, thus it is completely out of scope.
Moreover E mentions probability not the overall percentage.
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Re: A severe illness which affects the red blood cell count has been found  [#permalink]

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22 Sep 2018, 05:39
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Re: A severe illness which affects the red blood cell count has been found &nbs [#permalink] 22 Sep 2018, 05:39
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