Principles of Inheritance and Variation

Principles of Inheritance and Variation

Easy Questions

Advanced Botany

Plant Growth and Development
Organisms and Populations
Ecosystem
Biodiversity and Conservation
Environmental Issues
Microbes in Human Welfare
Strategies for Enhancement in Food Production
Molecular Basis of Inheritance
Principles of Inheritance and Variation
Sexual Reproduction in Flowering Plants
Reproduction in Organisms
The Living World
Respiration in Plants
Photosynthesis
Mineral Nutrition
Transport in Plants
Cell Cycle and Cell Division
Cell-The Unit of Life
Anatomy of Flowering Plants
Morphology of Flowering Plants
Plant Kingdom
Biological Classification
  1. Genetic variation in a population arises due to








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    Crossing over leads to recombination of genetic material on the two chromosomes. Mutation results in alternation of DNA sequences and consequently results in change in the genotype and the phenotype of an organism. In addition to recombination, mutation is another phenomenon that leads to variation in DNA.

    Correct Option: C

    Crossing over leads to recombination of genetic material on the two chromosomes. Mutation results in alternation of DNA sequences and consequently results in change in the genotype and the phenotype of an organism. In addition to recombination, mutation is another phenomenon that leads to variation in DNA.

  1. Which of the following statements is not true of two genes that show 50% recombination frequency?








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    Tightly linked genes show more linkage then crossing over.

    Correct Option: A

    Tightly linked genes show more linkage then crossing over.

  1. Which Mendelian idea is depicted by a cross in which the F1 generation resembles both the parents?








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    In Co-dominance F1 generation resemble both the parents. Ex: Blood group inheritance.

    Correct Option: C

    In Co-dominance F1 generation resemble both the parents. Ex: Blood group inheritance.

  1. If two persons with ‘AB’ blood group marry and have sufficiently large number of children these children could be classified as ‘A’ blood group: ‘AB’ blood group: ‘B’ blood group in 1: 2: 1 ratio. Modern technique of protein electrophoresis reveals presence of both ‘A’ and ‘B’ type proteins in ‘AB’ blood group individuals. This is an example of:








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    ABO blood group system in human beings is an example of codominant, dominant recessive and multiple alletes. Blood groups are controlled by the gene I located on 9th chromosome that has 3 multiple alleles, out of which any two are found in a person. In codominance both gene express it self completely.

    Correct Option: D

    ABO blood group system in human beings is an example of codominant, dominant recessive and multiple alletes. Blood groups are controlled by the gene I located on 9th chromosome that has 3 multiple alleles, out of which any two are found in a person. In codominance both gene express it self completely.

  1. In a population of 1000 individuals 360 belong to genotype AA, 480 to Aa and the remaining 160 to aa. Based on this data, the frequency of allele A in the population is:








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    According to Hardy Weinberg principle.
    p2 + 2pq + q2 = 1; (p + q)2 = 1
    (AA) p2 = 360 out of 1000 individual or p2 = 36 out of 100.
    q2 = 160 out of 1000 or q2 = 16 out of 100
    so q = √.16 = .4, As p + q = 1
    so p is 0.6.

    Correct Option: C

    According to Hardy Weinberg principle.
    p2 + 2pq + q2 = 1; (p + q)2 = 1
    (AA) p2 = 360 out of 1000 individual or p2 = 36 out of 100.
    q2 = 160 out of 1000 or q2 = 16 out of 100
    so q = √.16 = .4, As p + q = 1
    so p is 0.6.