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Which one of the following phenomena supports Darwin's concept of natural selection in organic evolution -
A
Production of 'Dolly', the sheep by cloning
B
Development of organs from 'stem' cells for organ transplantation
C
Development of transgenic animals
D
Prevalence of pesticide resistant insects
Detailed Solution
According to Darwin, variations exist in every population; the individuals whose variations make them better fitted to the environment survive and reproduce more, so their traits increase in the population over generations.
When a pesticide is used, most insects are killed, but a few that happen to carry genes for resistance survive.
These resistant insects reproduce, and their offspring inherit the resistance. With continued use of the pesticide, the resistant forms become more and more common.
So the prevalence of pesticide resistant insects is a clear example of natural selection; resistance of bacteria to antibiotics is a similar example.
Cloning (Dolly), organ development from stem cells and transgenic animals are artificial techniques of biotechnology, not natural selection.
So the phenomenon that supports natural selection is the prevalence of pesticide resistant insects.
When a pesticide is used, most insects are killed, but a few that happen to carry genes for resistance survive.
These resistant insects reproduce, and their offspring inherit the resistance. With continued use of the pesticide, the resistant forms become more and more common.
So the prevalence of pesticide resistant insects is a clear example of natural selection; resistance of bacteria to antibiotics is a similar example.
Cloning (Dolly), organ development from stem cells and transgenic animals are artificial techniques of biotechnology, not natural selection.
So the phenomenon that supports natural selection is the prevalence of pesticide resistant insects.