Answer:
During the last century in the industrial
regions of England, a light coloured peppered moth
Bistonbetularia was found on the bark of
trees. The tree bark was covered by whitish lichens, so light coloured moths
escaped unnoticed from predatory birds.
After industrialization, barks
got covered by smoke, so the white moths were selectively picked up by birds.
However, the black coloured moths escaped unnoticed against a dark background
and became abundant.
However, in recent years,
reduced industrial pollution has led to the growth of lichens again and thus,
the population of light coloured moths is again increasing.
This evolutionary story of moths
in England, thus reveals, that 'evolution is apparently reversible'.
You need to login to perform this action.
You will be redirected in
3 sec
