Evolution or Not

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Bistonbetularia is one species of engish moth found in Manchester,England. In this type of moth, there are 2 colors – light and dark(black). It was found out that prior to 1850, dark moths constituted less than2% of the population of all English moths. Later, the frequency of dark mothsincreased through the years. By 1900, 95% of the moths in Manchester and otherprime cities in England were of the dark type, whereas less dark moth type wasnoted in rural areas. The moth population changed from mostly light colored todark colored moths. The moth’s color was primarily determined by a single gene.When background information was investigated, it was found that in the late1800’s (1895-1899), England was in the age of industrial revolution. Soot fromfactories darkened the birch . In this type of moth, there are 2 colors – lightand dark (black). It was found out that prior to 1850, dark moths constituted lessthan 2% of the population of all English moths. Later, the frequency of darkmoths increased through the years. By 1900, 95% of the moths in Manchester andother prime cities in England were of the dark type, whereas less dark mothtype was noted in rural areas. The moth population changed from mostly lightcolored to dark colored moths. The moth’s color was primarily determined by asingle gene. When background information was investigated, it was found that inthe late 1800’s (1895-1899), England was in the age of industrial revolution.Soot from factories darkened the birch trees to which the moths landed and feedon. Against a sooty background, birds see the lighter moths better and ate moreof them. As a result, more dark moths survived until reproductive age and leftoffspring. The greater number of offspring left by dark moths is what causedincrease in frequency.

 

 

1. Does the changeof moth population from light colored to dark colored an evolution? Explain.

 

2. Does theincrease in relative abundance of the dark moth type due to natural selection?Explain.

 

3. Ifevolution took place in the moth population, what type of evolution is it?Microevolution or Macroevolution? Explain.

 

 

Help me with this..Thankz a lot..

 

 

[swansont]

First, what are your answers to the questions?