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. A gene is said to be dominant if








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    A dominant gene would lead to the expression of its phenotype irrespective of the fact whether its allelic gene is dominant or recessive.

    Correct Option: C

    A dominant gene would lead to the expression of its phenotype irrespective of the fact whether its allelic gene is dominant or recessive.

  1. The linkage map of X-chromosome of fruit fly has 66 units, with yellow body gene (y) at one end and bobbed hair
    (b) gene at the other end. The recombination frequency between these two genes (y and b) should be








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    Mapping of genes on chromosomes is based on the assumption that genes are arranged on the chromosome and that the percentage of crossing over (recombination frequency) between two genes is an index of their distance apart. Distances between genes is expressed as map units, where one map unit is defined as 1 per cent recombination.

    Correct Option: B

    Mapping of genes on chromosomes is based on the assumption that genes are arranged on the chromosome and that the percentage of crossing over (recombination frequency) between two genes is an index of their distance apart. Distances between genes is expressed as map units, where one map unit is defined as 1 per cent recombination.

  1. There are three genes a, b, c. Percentage of crossing over between a and b is 20%, b and c is 28% and a and c is 8%. What is the sequence of genes on chromosome?








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    Percent crossing over between two genes is proportional to the distance between them.

    Correct Option: A


    Percent crossing over between two genes is proportional to the distance between them.

  1. The genes controlling the seven pea characters studied by Mendel are now known to be located on how many different chromosomes?








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    The seven traits are now know to be present on 4 chromosome. But they do not show linkage, because of large distances between them on the chromosome.

    Correct Option: A

    The seven traits are now know to be present on 4 chromosome. But they do not show linkage, because of large distances between them on the chromosome.

  1. Which one of the following traits of garden pea studied by Mendel was a recessive feature?








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    Yellow seed colour is dominant over green seed colour.

    Correct Option: C

    Yellow seed colour is dominant over green seed colour.