Variations caused by sudden genetic changes are called mutations.

Q. The sudden heritable genetic changes in an organism are called mutation.

Q. Some mutations are a source of genetic variation. Which among the following can cause genetic variation that could lead to evolution?

Q. Select the mismatched pairs.
(i) Hugo de Vries - Mutations are sudden, random changes
(ii) Lamarck - Nature selects organisms with favourable variations and this mechanism of evolution is called natural selection
(iii) Ichthyosaurs - Reptiles
(iv) Darwin - Organs develop more if used and will degenerate if disused

Q. Variations caused by mutation, as proposed by Hugo de Vries, are