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प्रश्न
An important addition to Darwin’s work was the discovery that ______ occur, providing a source for the observed inherited variations.
रिकाम्या जागा भरा
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उत्तर
An important addition to Darwin’s work was the discovery that mutations occur, providing a source for the observed inherited variations.
Explanation:
Mutations are sudden, heritable changes in the DNA sequence that create new variations in organisms. These mutations serve as the raw material for evolution, supplying the genetic diversity upon which natural selection can act. Hugo de Vries was one of the scientists who emphasized the role of mutations in evolution, describing them as a primary source of new traits and genetic variability that Darwin's theory originally lacked.
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