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Variations arise due to recombinations(gene rearrangements) ,mutations etc.The former is the principal source of variation in sexually reproducing organisms and the latter is the source of variation in asexual organisms.According to Darwin variation arises due to chance since all the above mentioned process occur in nature spontanuously all organisms show variation

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Which is a source of genetic variation in sexually-reproducting organisms?

Basic source of variation in all organisms is mutation .


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The trait is the same for all organisms.


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The two types of variation shown by living organisms are genetic variation, which is differences in DNA sequences among individuals, and phenotypic variation, which refers to observable traits or characteristics that vary among individuals.


What are the islands where Charles Darwin observed variation among organisms?

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