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Pure lines and clones do not exhibit gen...

Pure lines and clones do not exhibit genetic variations for natural selection. Why?

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In pure line progeny and also clones all offspring of a parent possess same genotype. Therefore, they do not have differences either in morphology or physiology.
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Assertion : Hardy-Weinberg principle states that in the absence of disturbing influences, gene frequencies of large populations of sexually reproducing organisms do not change , provided that matings occur at random. Reason : The disturbing influences include mutation, gene flow, genetic drift, genetic recombination and natural selection.

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According to Darwin, organic evolution proceeds in which of the following orders? (a) Overproduction, variations, constancy of population size , natural selection (b) variations, constancy of population size , Overproduction, natural selection (c) Overproduction, constancy of population size ,variations, natural selection (d) variations, natural selection ,Overproduction, constancy of population size

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In the diagram, the x-axis denotes the number of individuals with a certain phenotype. The dotted lines denote the phenotypes favoured by natural selection. Which of the following inferences can be drawn from the given diagram?

While creation and presence of variation is directionless, natural selection is directional as it is in the context of adaptation. Comment.

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ICSE-PRINCIPLES OF INHERITANCE AND VARIATION-MULTIPLE CHOICE QUESTION
  1. Pure lines and clones do not exhibit genetic variations for natural se...

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  2. The genetic ratio of 9:3:3:1 is due to:

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  3. Choose the chromosome, in a human, that possesses least number of gene...

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  4. G. J. Mendel was a:

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  5. Select the incorrect match.

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  6. In a dihybrid cross, if you get 9:3:3:1 ratio it denotes that:

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  7. A monohybrid cross produced tall and dwarf pea plants in ratio of 3:1....

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  8. Common test to find genotype of hybrid is by:

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  9. Which one is a test cross?

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  10. Mating of an organism to a double recessive in order to determine whet...

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  11. A cross between two tall plants resulted in offspring having few dwarf...

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  12. The term genetics was proposed by:

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  13. The F2 genotypic ratio of monohybrid cross is:

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  14. A dihybrid for qualitative trait is crossed with homozygous recessive ...

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  15. In order to find out the different types of gametes produced by a pea ...

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  16. The autosomal disorder/disease in humans is:

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  17. Distance between the genes and percentage of recombination shows:

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  18. In Mirabilis jalapa, the number of F2 red flowered plants in a cross ...

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  19. In pea plants, yellow seeds are dominant to green. If a heterozygous y...

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  20. Which of the following is best suited for codominance?

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  21. Incomplete dominance is shown by:

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