Reduction in the frequency of heterozygous genotype with a concomitant increase in the frequency of homozygous genotype, in context of random mating is due to (1) Genetic drift (2) Intense […]
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CSIR NET Life Science Previous Year Questions and Solution on EVOLUTION AND BEHAVIOUR
How Inbreeding and Finite Population Size Reduce Genetic Variation
How is genetic variation in a population related to inbreeding and finite population size? (1) Both finite population size and inbreeding lead to decrease in genetic variation. (2) Only inbreeding […]
CSIR NET Life Science Previous Year Questions and Solution on Emergence of Evolutionary Thoughts
Why Sexual Reproduction Prevails: Genetic Diversity, Mutation Purging, and the Red Queen Hypothesis
In spite of its two-fold cost, sexual reproduction is the most dominant mode of reproduction among the living organisms. Which of the following reasons might account for this? (A) Sexual […]
CSIR NET Life Science Previous Year Questions and Solution on Emergence of Evolutionary Thoughts
Adaptive Radiation in Galapagos Finches: How Mutation and Selection Shaped Beak Diversity
The Galapagos finches were an important clue to Darwin’s thinking about the origin of species. These finches are believed to have descended from a single ancestral species that colonized the […]
CSIR NET Life Science Previous Year Questions and Solution on Emergence of Evolutionary Thoughts
How Natural Selection Favors Moth Color Morphs in Different Forest Environments
A moth species occurs as two distinct morphs based on wing colour — pale and dark. In the forest there are trees with dark coloured trunks as well as those […]
CSIR NET Life Science Previous Year Questions and Solution on Emergence of Evolutionary Thoughts
The Peppered Moth: A Classic Example of Natural Selection in Action
In pre-industrial period in England, peppered moths had light coloration which effectively camouflaged’ them against light coloured trees and lichens. During industrial revolution, many lichens died out and trees became […]
CSIR NET Life Science Previous Year Questions and Solution on Emergence of Evolutionary Thoughts
Heterozygote Advantage: Why the Sickle Cell Allele Persists at High Frequency in African Populations
In Africa “AS” represent a carrier of sickle cell anemia, where A is the allele for normal haemoglobin and S for sickle cell haemoglobin. If the allele S is maintained […]
CSIR NET Life Science Previous Year Questions and Solution on Emergence of Evolutionary Thoughts
Sickle Cell Anemia and Malaria: The Evolutionary Advantage of Heterozygote Superiority
It is found that people with the genetic disease called sickle cell anemia are resistant to malaria. Which of the following best describes the underlying mechanism? (1) Frequency-dependent selection (2) […]
CSIR NET Life Science Previous Year Questions and Solution on Emergence of Evolutionary Thoughts
How Directional Selection Alters Trait Distribution in Populations
Directional Selection for a particular trait will lead to the frequency of the trait: (1) being normally distributed in the population. (2) always showing a left-skewed distribution in the population. […]
CSIR NET Life Science Previous Year Questions and Solution on EVOLUTION AND BEHAVIOUR
Co-evolution: The Key Evolutionary Process Shaping the Immune System
Which of the following evolutionary processes played an important role in the evolution of immune system? (1) Reproductive isolation (2) Adaptive radiation (3) Neutral evolution (4) Co-evolution What Is […]
