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Principles of Inheritance and Variation Test - 78

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Principles of Inheritance and Variation Test - 78
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  • Question 1
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    In a cross between individuals homozygous for (a, b) and wild type($$+ +$$). In this cross $$700$$ out of $$1000$$ individuals were of parental type. Then the distance between a and b is?
    Solution

    Solution:
    Correct answer is option C.
    Explanation for correct answer:

    The distance between a and b =  total variety of offspring /no.of recombinants x 100

    In this cross, 700/1000 i.e., 70% of individuals are of the parental type. 

    This means that rest 30% individuals (300) are recombinant types.

    Therefore, the distance between a and b = 300/1000 x 100 = 30 maps unit.

  • Question 2
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    $$XYY \rightarrow$$ composition
  • Question 3
    1 / -0
    In sickle cell anaemia, an amino-acid substitution is?
  • Question 4
    1 / -0
    In garden pea, starch is synthesised effectively in
  • Question 5
    1 / -0
    What is common between Mendelian monohybrid cross and dihybrid cross?
  • Question 6
    1 / -0
    Mendelian monohybrid ratio is?
  • Question 7
    1 / -0
    Repeated selfing produces?
  • Question 8
    1 / -0
    Fruit shape in shephered's purse(capseila bursa) is of two types- triangular and top-shaped. Triangular fruit shape(T) is dominant over top-shape(t). Following table summaries the results of several crosses.
    CrossResult
    Strain $$1\times$$ ttAll triangular
    Strain $$2\times$$ tt$$1$$ triangular $$: 1$$ top-shaped
    Strain $$3\times$$ ttAll top-shaped
    Strain $$4\times$$ tt$$3$$ triangular $$: 1$$ top-shaped
    Which pair of strains possess the genotype Tt?
  • Question 9
    1 / -0
    In South-African populations, a gene mutation that does not allow the speed of malaria, actually causes?
  • Question 10
    1 / -0
    The coupling and repulsion theory of Bateson and Punnett later on modified in linkage and crossing over by Morgan. Two completely linked genes show a dihybrid.
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