UPSC CSE Prelims
Question 84
At present, scientists can determine the arrangement or relative positions of genes or DNA sequences on a chromosome. How does this knowledge benefit us ?
- It is possible to know the pedigree of livestock.
- It is possible to understand the causes of all human diseases.
- It is possible to develop disease-resistant animal breeds.
Which of the statements given above is/are correct ?
View correct answer and explanation
Correct answer: C
Correct Option: C
Explanation: Genetic mapping identifies gene locations and linked markers useful in tracing ancestry and selecting disease-resistant livestock, but cannot explain every human disease.
Statement / Item-wise Analysis:
1: Correct - Correct: genetic markers help verify pedigrees and relatedness in breeding.
2: Incorrect - Incorrect: human illnesses also have environmental, infectious and complex multigenic causes.
3: Correct - Correct: identifying resistance-associated markers helps selective or genomic breeding.
Option-wise Analysis:
A: Incorrect - includes unsupported item 2; omits supported item 3.
B: Incorrect - includes unsupported item 2; omits supported items 1, 3.
C: Correct - includes the supported statements and excludes the unsupported ones.
D: Incorrect - includes unsupported item 2.