The idea of "survival of the fittest" was given by

Which of the following concepts is attributed to Charles Darwin?

In the diagrammatic representation of the operation of natural selection,two peaks are formed. This condition shows the effect of . . . . . . .

According to Hugo de Vries,the mechanism of evolution is

Hugo de Vries gave the mutation theory to explain the mechanism of evolution. He conducted his experiments on ...... .

Random unidirectional change in allele frequencies that occurs by chance in all populations and especially in small populations is known as