Evolution Question 79
79. Phenomenon of ‘Industrial melanism’ demonstrates
(a) natural selection
(b) induced mutation
(c) geographical isolation
(d) reproductive islolation
Show Answer
Answer : a
Hints & Solution
(a) During industrial revolution in England the frequency of melanic forms of species of Peppered Moth (Biston betularia) increased in polluted areas. Generally the moths are light coloured. This change in colour is known as “Industrial melanism”. The change was presumed to be a result of natural selection since the melanic moths better matched the blackened tree trunks where they rest during day.
