Describe three mechanisms by which genetic variability can be produced in nature.

Solution

(i) By hybridization, two different individuals (different species or different genera) are made to hybridize. The resultant hybrid will be genetically variable.

(ii) By mutations. Mutations are induced artificially by radiations or chemical mutagens. Thus creating variations and leading to the evolvement of a new species even.

(iii) Recombination- the process of recombination during the cell division results in the variation in the genes.

Some More Questions From Evolution Chapter

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

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Evolution

Describe three mechanisms by which genetic variability can be produced in nature.

Some More Questions From Evolution Chapter

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 ?

Give the three key factors of the modern concept of evolution.

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