Evolution and Behavior PYQ's

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Previous Year Questions:

1. Column A lists names of evolutionary biologists and column B lists descriptions of evolutionary mechanisms proposed by them in random order.                                                               (June 2017)

Column A	Column B
A) Jean Baptiste Lamarck	i) Variation at the molecular level is selectively neutral
B) Charles Darwin	ii) Inheritance of acquired characters
C) Motoo Kimura	iii) Differential reproduction of genotypes
D) Sewall Wright	iv) Changes in allele frequency due to random genetic drift

1) A-i, B-ii, C-iv, D-iii

2) A-ii, B-iii, C-i, D=iv

3) A-iii, B-i, C-ii, D-iv

4) A-ii, B-iii, C-iv, D-i

Ans. 2 - A-ii, B-iii, C-i, D=iv

Explanation: Lamarck gave the theory of inheritance of acquired characters. In modern genetics natural selection is defined as the differential reproduction of genotypes which was given by Charles Darwin. Motoo Kimura gave the neutral theory of molecular evolution which states that most evolutionary changes at the molecular level are caused by random genetic drift of selectively neutral nucleotide substitution. Sewall Wright put forward the concept of changes in allele frequency due to random genetic drift.

2. Given below are names of scientists and phrases describing their work, which may or may not be matched.                                                                                                                            (Nov 2020)

Name of Scientist	Work
i) Wallace	A. Inheritance of acquired characters
ii) Lyell	B. Natural selection is differential survival or reproduction
iii) Lamarck	C. Processes that alter the earth are uniform through time.
iv) Cuvier	D. Earth’s geology and natural history have been shaped by periods of catastrophic extinction and new creations.
	E. Ontogeny recapitulates phylogeny.

Which of the following options represents correct matches between the scientists and his/her work?

1) i-A, ii-B, iii-C, iv-E          2) i-B, ii-C, iii-A, iv-D

2) i-A, ii-C, iii-E, iv-B          4) i-E, ii-D, iii-A, iv-C

Ans. 2 - i-B, ii-C, iii-A, iv-D

Explanation: i) Wallace - Wallace is famously known for his work on natural selection, which matches with option 2) i-B.

ii) Lyell - Lyell's work is associated with the idea that "Processes that alter the earth are uniform through time," which matches with option 2) ii-C.

iii) Lamarck - Lamarck is best known for his theory of the inheritance of acquired characteristics, matching with option 2) iii-A.

iv) Cuvier - Cuvier's work is linked with the idea that "Earth’s geology and natural history have been shaped by periods of catastrophic extinction and new creations," which corresponds with option 2) iv-D.

So, the correct match is option 2) i-B, ii-C, iii-A, iv-D.

PYQ's of:

• Unit 1: https://anaszoology.blogspot.com/2024/05/molecules-and-their-interactions.html