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Principles of Inheritance and Variation Test - 30

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Principles of Inheritance and Variation Test - 30
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Which one of the following represents a test cross?
    Solution
    A test cross is a cross between heterozygous F$$_1$$ generation and recessive parent.
    That is, Ww (F$$_1$$ generation) x ww (recessive parent)
    Gametes: W, w               
  • Question 2
    1 / -0
    Mendel was lucky, because
    Solution
    Mendel was lucky because he used pea plant i.e. Pisum sativum, they are bisexual, they had pure breeding varieties with observable characters, & each character is regulated by one type of gene, whether it is tall, dwarf, round or wrinkled etc. It was an ideal choice for him.
    So, the correct answer is "The genes for different characters are located on different chromosomes in Pisum sativum".
  • Question 3
    1 / -0
    How many types of gametes may be produced by genotype DdEeFf?
    Solution
    Genotype : DdEeFf 
    Combination of Gametes:
    DEF, DEf, DeF, Def, dEF, dEf, deF and  def
  • Question 4
    1 / -0
    When a cross is done between an offspring and it's parent, it is known as
    Solution

    Backcrossing is a crossing of a hybrid with one of its parents or an individual genetically similar to its parent, in order to achieve offspring with a genetic identity which is closer to that of the parent. This method has long been used in horticulture, e.g. to incorporate desirable traits to the elite line of crops. At present, the deliberate back crossing is carried out to breed and produce gene knockouts used in Genetics research.

  • Question 5
    1 / -0
    Mendel crossed a pure white-flowered recessive pea plant with a dominant pure red-flowered plant. The first generation of hybrids from the cross should show
    Solution
    Pure white coloured recessive pea plant - rr
    Pure red coloured dominant pea plant - RR
    Cross between both: RR X rr ---------> Rr (Heterozygous Red)
    According to Mendel's law of dominance, the dominant character will express even if it is heterozygous.
  • Question 6
    1 / -0

    How many different types of genetically different gametes will be produced by a heterozygous plant having the genotype AaBbCc?

    Solution
    Gametes produced by: 
    AaBbCc  -------> ABC, ABc, AbC, Abc, aBC, aBc, abC and abc
    Thus, it can produce 8 gametes.
  • Question 7
    1 / -0

    A cross in which an organism showing a dominant phenotype (genotype unknown) is crossed with the recessive parent in order to know its genotype is called as  

    Solution
    A test cross is done to identify the genotype of the parent, in this type of cross-breeding is done with the recessive individual to determine whether it is homozygous or heterozygous by analyzing the proportions of phenotypes of the offspring, backcross is the cross between offspring and any of its parents. 
    So, the correct answer is " Test cross".
  • Question 8
    1 / -0
    In the monohybrid cross Tt x tt, the phenotypic ratio of the progeny would be 
    Solution
    Cross between         Tt X tt
    Gametes:                   T and t
    Crossing yields:        Tt and tt
    The cross gives the ratio  of 1:1
    The cross is between F1 hybrid and recessive parent.
  • Question 9
    1 / -0
    A dwarf pea plant was treated with gibberellic acid (GA), it grew as tall as the homozygous tall pea plant. If this GA-treated plant is now crossed with a pure tall pea plant then the phenotypic ratio in the next generation is likely to be
    Solution
    Pure recessive dwarf plant tt crossed with pure tall plant TT: 
                tt  X TT ----------> tT (Heterozygous tall)
    Thus, we will get all tall plants as a result of the cross. Gibberellic acid will cause the increase in length of shoot. But it cannot make any change in the genetic make up of the individual and thus the phenotype is not carried on to the next generation.
  • Question 10
    1 / -0
    From a single ear of corn, a farmer planted 200 kernels which produced 140 tall and 40 dwarf plants. The genotype of these offsprings are most likely
    Solution
    Mature corn plants produce ears that contain hundreds of seeds or kernels. Each seed is formed by the fertilization of an egg by a male gamete. It has both the allele for height T and t, out of which T allele for the height is the dominant one. So, the offspring produced by the crossing of Tt and Tt will have genotype as TT, Tt and tt which produces 140 tall from TT and Tt gamete and 40 dwarf plants from tt gametes.
    So, the correct answer is option A.
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