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Principles Of Inheritance And Variation

Question
CBSEENBI12047013
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A baby has been born with a small tail. It is a case exhibiting

  • retrogressive evolution

  • mutation

  • atavism

  • metamorphosis

Solution

C.

atavism

In biology, an atavism is a modification of a biological structure whereby an ancestral trait reappears after having been lost through evolutionary change in previous generations. Atavisms can occur in several ways, one of which is when genes for previously existing phenotypic features are preserved in DNA, and these become expressed through a mutation that either knocks out the overriding genes for the new traits or makes the old traits override the new one.

Some More Questions From Principles of Inheritance and Variation Chapter

Mention the phenomenon of pleiotropy by giving an example.

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What do the symbols square and circle in a pedigree chart indicate ?

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