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प्रश्न
Which type of selection explains industrial melanism observed in moth, Biston bitularia?
पर्याय
Stabilising
Directional
Disruptive
Artificial
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उत्तर
Which type of selection explains industrial melanism observed in moth, Biston bitularia directional.
Explanation:
During industrial pollution, dark-colored (melanic) moths had a selective advantage due to camouflage on soot-darkened trees, leading to an increase in their population. This directional change in phenotype frequency towards the darker form illustrates directional selection responding to environmental changes caused by industrialization.
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संबंधित प्रश्न
p2 + 2pq + q2 = 1. Explain this algebraic equation on the basis of Hardy Weinberg's principle.
State Hardy-Weinberg’s principle.
Differentiate between Directional natural selection and Disruptive natural selection.
Very short answer question.
State the Hardy – Weinberg equilibrium.
A population will not exist in Hardly Weiberg equilibrium if ____________.
In a population, Hardy Weinberg equilibrium is disturbed by following factors EXCEPT ______.
Among the five factors that are known to affect Hardy-Weinberg equilibrium, three factors are gene flow, genetic drift and genetic recombination. What are the other two factors?
State and explain any three factors affecting allele frequency in populations.
Enumerate three most characteristic criteria for designating a Mendelian population.
“Migration may enhance or blurr the effects of selection”. Comment.
List any two factors that can disturb the genetic equilibrium.
The graphs below show three types of natural selection. The shaded areas marked with arrows show the individuals in the population who are not selected. The dotted vertical lines show the statistical means.
 |
 |
 |
| character Graph A |
character Graph B |
character Graph C |
- What names are given to the types of selection shown in graphs A, B and C?
- After the selection has operated for several generations in the above populations indicated as, Graph A, B and C, graphically illustrate the probable results.
Write Hardy Weinberg's equation.
State Hardy Weinberg's principle.
A population of 200 fruit flies is in Hardy Weinberg equilibrium. The frequency of the allele (a) 0.4. Calculate the following:
The number of carrier fruit flies.
The black colour on the beak of finches dominates over the yellow colour. There are 210 individuals with the genotype DD, 245 individuals with the genotype Dd and 45 individuals with the genotype dd. Deduce the frequency of individuals with dominant, heterozygous, and recessive traits.
What is the primary statement of Hardy-Weinberg's principle?
What is the bottleneck effect in population genetics?
What is the role of natural selection in affecting Hardy-Weinberg equilibrium?
How does gene migration or gene flow affect allele frequencies?
Why are alleles present in homozygous recessive organisms exposed to environmental selection?
Which condition for Hardy-Weinberg equilibrium specifically eliminates random fluctuations in allele frequency?
