Question

De Vries gave his mutation theory on organic evolution while working on -

Answer 1

Oenothera lamarckiana

Answer 2

Answer:

De Vries gave his mutation theory on organic evolution while working on the evening primrose( Oenothera lamarckiana).

Explanation:

He examined the seeds of the evening primrose and found several varieties produced by them in the garden. This made him postulate the mutation theory.

According to the mutation theory, evolution or more precisely the origin of new species occurs more frequently with large scale changes.