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Class 10 Class 12

One of the important consequences of geographical isolation is

• no change in the isolated fauna

• preventing speciation

• speciation through reproductive isolation

• random creation of new species

D.

random creation of new species

Speciation is the formation of new species and the development of species diversity occurs when gene flow within the common pool is interrupted by an isolating mechanism. The isolation can occur through geographical separation of population, known as allopatric speciation.

Speciation is the formation of new species and the development of species diversity occurs when gene flow within the common pool is interrupted by an isolating mechanism. The isolation can occur through geographical separation of population, known as allopatric speciation.

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When did life appear on earth ?

500 million years ago.
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Arrange the following substances in a proper sequence with regard to the formation of chemical constituents at the time of origin of life :

Sugar, methane, nucleic acid and amino acid.

Methane—sugar—amino acid—nucleic acid.
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What is the phenomenon called when the original drifted population becomes founders?

Founder Effect.
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Give another name for origin of life from non living matter.

Abiogenesis
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What conditions were created by Miller in his experiment?

Miller  created electric discharge in a closed flask that contained CH4, NH3, H2 and water vapour at high temperature like 800$°\mathrm{C}$
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