English moths originally had a normal (bell-curve) distribution phenotypes. What
ID: 83027 • Letter: E
Question
English moths originally had a normal (bell-curve) distribution phenotypes. What was the result of the smoke and soot from the industrial revolution on those English moths?
A) All phenotypes in the original population were reduced as the population declined.
B) Both extremes of the curve were selected against and the curve became narrow.
C) Heterozygote individuals were weaker and died off.
D) The entire population of moths became darker but retained the bell-shaped curve.
E) The moth population went extinct.
Explanation / Answer
Option D is the correct answer.
'A' is not correct because both phenotypes so not get reduced.
'B' Option says that extremes were removed and curve becomes narrow, this kind of curve is an example for stabilising selection but the example given in the question is a kind of directional selection (grey moths population is replaced with black population)
Option C is totally inconsiderable because the condition of heterozygous to be weak is not at all concerned with this case
Option E says that moth population become extinct...but they were not extinct, they are still alive....
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