Question:

Industrial melanism as observed in peppered moth proves that:-

Updated On: Mar 26, 2024
  • Melanism is a pollution-generated feature
  • The true black melanic forms arise by a recurring random mutation
  • The melanic form of the moth has no selective advantage over lighter form in industrial area
  • The lighter-form the moth has no selective advantage either in polluted industrial area or non-polluted area
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The Correct Option is B

Solution and Explanation

Industrial melanism is a term used to describe the evolutionary process in which darker individuals come to predominate over lighter individuals since the industrial revolution as a result of natural selection. In 1848 a black form of the moth was recorded in Manchester and by 1895, 98% of the peppered moth population in Manchester was black. This black "melanic" form arose by a recurring random mutation, but its phenotypic appearance had a strong selective advantage in industrial areas.
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Concepts Used:

Evolution

Evolution is a process that occurs in changes in the genetic content of a population over time. Evolutionary change is generally classified into two: microevolution and macroevolution. The process of changes in allele frequencies in a population over time is a microevolutionary process. Three main mechanisms that cause allele frequency change are natural selection, genetic drift, and gene flow. On the other hand, macroevolution refers to change at or above the level of the species.