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Principles of I...

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  • Question 1
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    Autopolyploidy is the presence of more than two sets of same chromosome or more than two genomes. Which of the following is not a characteristic feature of autopolyploid plants?

  • Question 2
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    In which of the following types of gene interaction, one character is controlled by two pairs of non-allelic independent genes?

  • Question 3
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    Sometimes, one gene has multiple phenotypic effects. This type of gene is called as

  • Question 4
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    Directions For Questions

    In the following question, two statements are given. One is assertion and the other is reason. Examine the statements carefully and mark the correct answer according to the instructions given below.

    ...view full instructions

    Assertion: When one gene in its homozygous or heterozygous dominant state masks the expression of the other gene, it is called dominant epistasis.
    Reason: The modified F2 phenotypic ratio of dominant epistasis is 12 : 3 : 4.

  • Question 5
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    Sickle cell anaemia is an autosomal genetic disorder and is common in tropical Africa. It is caused by the substitution of

  • Question 6
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    Match column I with column II.

    Column I Column II
    a. F plasmids 1. They have genes that code for colicins, the proteins that kill sensitive E.coli.
    b. R plasmids 2. They carry genes for resistance to antibodies.
    c. Col plasmids 3. They carry the fertility factor that is responsible for bacterial conjugation.

  • Question 7
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    There are four types of viruses on the basis of their genetic material. Which of the following viruses has double stranded DNA?

  • Question 8
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    Which of the following chromosomes has two equal arms and assumes 'V' shape in anaphase stage of cell division?

  • Question 9
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    In which of the following types of sex chromosomes, female sex is heterogametic and two types of eggs are laid by the females?

  • Question 10
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    Match the following:
     

    a. Substitution mutations 1. These are artificial mutations induced with the help of certain agents called mutagens.
    b. Spontaneous mutations 2. These are replacements of one nitrogenous base of DNA by another nitrogenous base or its derivatives.
    c. Induced mutations 3. These occur suddenly at random in nature but in low frequencies.

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