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Principles Of Inheritance And Variation

Question
CBSEENBI12003200
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de Vries gave his mutation theory on organic evolution while working on

  • Althea rosea

  • Drosophila melanogaster

  • Oenothera lamarckiana

  • Pisum sativum

Solution

C.

Oenothera lamarckiana

Hugo de Vries (1848-1935) proposed mutation theory for the formation of new species. According to him, new species are not formed by continuous variations but by sudden appearance of variations which he named as mutations. He stated that these mutations are heritable and persist in successive generations. For proposing this theory he performed experiments on Oenothera lamarckiana (evening primrose).

Some More Questions From Principles of Inheritance and Variation Chapter

Name one trait that does not blend.

Give one example of genetic trait for each of the following in humans : (i) Lethality (ii) Multiple allelism.

What for symbols AA and Aa stand ?

Mention the phenomenon of pleiotropy by giving an example.

Name the plant that shows incomplete dominance in respect of the colour of its flower.

Write the genotypes of man with blood group A.

What is Mendel’s monohybrid phenotypic ratio ?

Write down Mendel’s dihybrid Phenotypic ratio 

Who were the rediscoverers of Mendelism ?

What are the real determinants of what an organism will become ?

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