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Evolution

Question

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Describe De Vries Mutation theory.

Solution

De Vries Mutation Theory Hugo de Vries (1848-1935) was a Dutch Botanist. He performed experiments on the Evening Primrose (Oenothera lamarckiana).

According to this theory, new species arise suddenly showing abrupt deviations in characters from the normal forms. Thus evolution is not a slow and gradual process but a sudden discontinuous and process. He believed that mutation caused speciation and hence called it saltation (single step large mutation)

Some More Questions From Evolution Chapter

Mention the type of nutrition in the cells originated first during the origin of life.

Which group of organisms were responsible for appearance of free oxygen in the atmosphere of the primitive earth ?

What is meant by the term fossil ?

What is the type of evolution in which the same structure developed along different directions due to adaptations to different needs ?

Name the different eras of geologic time scale.

What is single step large mutation?

Consider a thorn in Bougainvillea and a tendril in cucurbita. Are these two organs homologous or analogous ? Give reason.

Give two examples that represent adaptive radiation.

Which theory attempts to explain to us the origin of universe?

Evolution is a discontinuous process. Is it correct ?

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