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Principles of Inheritance and Variation Test - 58

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Principles of Inheritance and Variation Test - 58
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Mutation cannot change
  • Question 2
    1 / -0
    Punnet square is used to know
    Solution

    It was developed by  a british geneticist, Reginold.C.Punnett

    It is a graphical representation to indicate all possible union of gametes during fertilization and to calculate the probability of all possible genotypes of offsprings in a genetic cross.

    The possible gametes are written on two sides, usually the row and left columns.

    All possible combinations of gametes during fertilization are represented in boxes below in the squares, which generates a square output form.

    So, the correct option is ‘Probable result of a cross’.

  • Question 3
    1 / -0
    Tschermak-Seysenegg, a rediscoverer of Mendel's work belonged to
    Solution

    Erich Tschermak was an Austrian agronomist who developed several new disease-resistant crops, including wheat-rye and oat hybrids. He independently rediscovered Gregor Mendel's work on genetics. He was a plant breeder, and his hybridization experiments were done with the idea of improving crops using the laws of heredity.

    So, the correct option is ‘Austria’.

  • Question 4
    1 / -0
    XY sex chromosomes were discovered by
    Solution
    Nettie Stevens and Edmund Beecher Wilson are credited with independently discovering, in 1905, the chromosomal XY sex-determination system, i.e. the fact that males have XY sex chromosomes and females have XX sex chromosomes.

    So, the correct answer is 'Nettie Stevens'.
  • Question 5
    1 / -0
    Genetic identity of human male is known by
    Solution
    Human male has 'XY' sex chromosome whereas Human female has 'XX' sex chromosomes.

    So, the correct answer is 'Sex chromosomes'.
  • Question 6
    1 / -0
    Smallest segment of genetic material affected by mutation is?
    Solution
    1) Recon: They are locations within a gene which participate in recombination. There is a minimum distance between recons within a gene, and recombination cannot occur within a recon. The term “recon” is a unit of recombination.
    2) Cistron: It is the largest element in a gene which encodes a polypeptide during protein synthesis.
    3) Muton: the smallest element of genetic material capable of undergoing a distinct mutation, usually identified as a single pair of nucleotides.
    4) An exon is any part of a gene that will encode a part of the final mature RNA produced by that gene after introns have been removed by RNA splicing.

    So, the correct answer is 'Muton'.
  • Question 7
    1 / -0
    A point mutation is?
    Solution
    The mutation causing sickle cell anemia is a single nucleotide substitution (A to T) in the codon for amino acid 6. The change converts a glutamic acid codon (GAG) to a valine codon (GTG). Sickle cell anemia is the result of a point mutation, a change in just one nucleotide in the gene for hemoglobin. This mutation causes the hemoglobin in red blood cells to distort to a sickle shape when deoxygenated. The sickle-shaped blood cells clog in the capillaries, cutting off circulation.
    So, the correct answer is 'Sickle cell anaemia'.
  • Question 8
    1 / -0
    Which one is found in males only?
    Solution
    Females have XX sex chromosomes whereas males have XY sex chromosomes. Hence Y-chromosomes are found in males only.

    So, the correct answer is 'Y-chromosome'.
  • Question 9
    1 / -0
    Checkerboard method of calculations was developed by
    Solution

    It was developed by a British geneticist, Reginold.C.Punnett.

    It is a graphical representation to indicate all possible union of gametes during fertilization and to calculate the probability of all possible genotypes of offsprings in a genetic cross.

    The possible gametes are written on two sides, usually the row and left columns.

    All possible combinations of gametes during fertilization are represented in boxes below in the squares, which generates a square output form. So, the correct option is ‘Punnett’.

  • Question 10
    1 / -0
    In human zygote male sex is determined by
    Solution
    Men determine the sex of a baby depending on whether their sperm is carrying an X or Y chromosome. An X chromosome combines with the mother's X chromosome to make a baby girl (XX) and a Y chromosome will combine with the mother's to make a boy (XY).
    'Strength of father' and 'Nutrition of mother' has no link in determining the gender of an offspring.
    So, the correct answer is 'Composition of required chromosome pair'.
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