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 […]
Tag: CSIR NET Life Science Previous Year Questions and Solution on Emergence of Evolutionary Thoughts
CSIR NET Life Science Previous Year Questions and Solution on Emergence of Evolutionary Thoughts
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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 Emergence of Evolutionary Thoughts
Disruptive Selection: How Nature Favors Extremes and Drives Evolutionary Diversity
Selection in which two extreme phenotypes leave more offspring than the intermediate phenotype is called (1) directional selection. (2) disruptive selection. (3) stabilizing selection. (4) neutral selection. Correct answer: (2) […]
CSIR NET Life Science Previous Year Questions and Solution on Emergence of Evolutionary Thoughts
How Stabilizing Selection Maintains Both Alleles in a Population
If natural selection favors an average phenotype by selecting against extreme variation, under such condition (1) Both alleles will coexist in population (2) Only dominant alleles will exist (3) Only […]
CSIR NET Life Science Previous Year Questions and Solution on Emergence of Evolutionary Thoughts
Heterozygote Advantage: How Both Alleles Persist in a Population
In a population individuals having heterozygous phenotype are more favored then homozygous dominant which are more favored then homozygous recessive genotypes, under such condition (1) Recessive alleles would be lost […]
CSIR NET Life Science Previous Year Questions and Solution on Emergence of Evolutionary Thoughts
Types of Natural Selection in Drosophila: Stabilizing, Disruptive, and Directional Selection Explained
The body weight of adult female of a strain ofDrosophila is 1.8±0.45 mg (mean ± standard deviation).In a laboratory experiment, each of the 3 groups (A, B, C) of this strain […]
CSIR NET Life Science Previous Year Questions and Solution on Emergence of Evolutionary Thoughts
Understanding Stabilizing Selection: How Natural Selection Narrows Variation in Drosophila Body Size
The mean (µ) and standard deviation (σ) of body size in a Drosophila population are 8.5 and 2.2 mm, respectively. Under natural selection over many generations the µ and σ […]
CSIR NET Life Science Previous Year Questions and Solution on Emergence of Evolutionary Thoughts
Heterozygote Advantage: The Natural Selection Mechanism That Preserves Genetic Diversity
Under which condition of natural selection no allele would be lost when (1) Any one homozygote is favored (2) Both homozygote are favored (3) Heterozygote are favored (4) Heterozygote is […]
