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Principles of I...

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  • Question 1
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    In sweet pea, genes C and P are necessary for colour in flowers. The flowers are white in the absence of either or both the genes. What will be the percentage of coloured flowers in the offspring of the cross  $$Ccpp \times  ccPp$$ ? 

  • Question 2
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    Choose the correct answer from the alternatives given.
    Match column I with column II and select the correct option from the given codes.

    Column IColumn II
    A.A single trait controlled by three or more than three alleles(i)Pleiotropy
    B.A single trait controlled by three or more than three genes(ii)Multiple alleles
    C.A single gene exhibits multiple phenotypic expression(iii)Polygenic inheritance

  • Question 3
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    Match the terms in Column I with their description in column II and choose the correct option :

    Column IColumn II
    (a)Dominance(i)Many genes govern a single character
    (b)Codominance(ii)In a heterozygoes organism only one allele expresses itself.
    (c) Pleiotropy(iii)In a heterozygous organism both alleles express themselves fully
    (d)Polygenic inheritance(iv)A single gene influences many characters

  • Question 4
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    In $${F}_{2}$$ generation of quantitative inheritance, a ratio of 1:4:6:4:1 is obtained instead of 

  • Question 5
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    Children have A and B types of blood. What are the blood types of parents not possible?   

  • Question 6
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    How many pairs of true breeding varieties were selected by Mendel for his experiment on pea plant?

  • Question 7
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    If a polygenic trait is controlled by three gene pairs then what will be the probability of individuals in $$F_2$$ generation showing exacts phenotype to F$$_1$$ progeny?

  • Question 8
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    Sometimes a gene which carries a major disadvantage in homozygous state confers an advantage in the heterozygous condition. Explain by giving a suitable example.

  • Question 9
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    In Drosophila, the allele for a normal grey body colour G is dominant to ebony body g. The following table summarises the results of several crosses.


    S. No.CrossResult
    1.strain 1*ggall wild-type
    2.strain 2*gg1 wild type: 1 ebony
    3.strain 3*ggall ebony
    4.strain 4*Gg3 wild type:1 ebony

    Which strain both have the genotype Gg?

  • Question 10
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    Choose the incorrect pair among the Mendel choose for his experiments.

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