LSAT 128 – Section 3 – Question 13

LSAT 128 - Section 3 - Question 13

December 2008

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Question
QuickView		 Type Tags Answer
Choices		 Curve Question
Difficulty		 Psg/Game/S
Difficulty		 Explanation
PT128 S3 Q13
+LR
Must be true +MBT
Conditional Reasoning +CondR
A
5%
163
B
93%
167
C
1%
155
D
1%
156
E
1%
164
120
133
147
 +Easiest 145.461 +SubsectionMedium

Live Commentary

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Sexual reproduction is achieved when the gamete of a male organism unites with the gamete of a female organism to form a new and genetically unique cell. Each of the two gametes contributes equally to the genetic material found in the new cell’s nucleus. However, the genetic material found in the new cell’s cytoplasm (the part of a cell outside the nucleus) is contributed exclusively by the female’s gamete. A certain type of genetic material, referred to as GM62, is found only in cytoplasm.

Summary
Sexual reproduction occurs when the gamete of a male and the gamete of a female unite and form a genetically unique cell.

Each gamete contributes equally to the genetic material in nucleus of the new cell.

The genetic material in the cytoplasm of the new cell comes exclusively from the female’s gamete.

GM62 is genetic material found only in the cytoplasm.

Notable Valid Inferences
GM62 comes from the female’s gamete.

A
All female organisms contribute GM62 to their offspring.
This could be false. We know that GM62 can only come from female organisms, but we don’t know that all female organisms contribute GM62 to their offspring. Coming from a female organism is a necessary, not sufficient, condition for contributing GM62.
B
Only female organisms can contribute GM62 to their offspring.
This must be true. We know that only female organisms can contribute GM62 because only female organisms contribute the genetic material in the cytoplasm, and GM62 is found only in the cytoplasm.
C
Genetic material is evenly divided between the nucleus and the cytoplasm of a new cell.
This could be false. We have no information to indicate the breakdown of genetic information between the cytoplasm and the nucleus.
D
The role of the male gamete in sexual reproduction is less important than the role of the female gamete.
This could be false. The stimulus does not provide any information about relative importance of different gametes.
E
It is likely that other types of genetic material that are contributed exclusively by the male gamete will be identified.
This could be false. The stimulus does not provide any information to indicate what kinds of genetic material will be identified in the future.

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LSAT PrepTest 128 Explanations

Section 1 - Reading Comprehension

Section 2 - Logical Reasoning

Section 3 - Logical Reasoning

Section 4 - Reading Comprehension

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