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Principles of I...

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  • Question 1
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    Johannson in 1903 formulated the concept of pure lines while working with Phaseolus vulgaris. Which of the following statements is true with reference to pure lines?

  • Question 2
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    When a cross is made between the pure red-flowered and pure white flowered Mirabilis jalapa plants that yield hybrid plants with pink flowers, the phenotypic F2 ratio is found to be 1 : 2 : 1. This is a characteristic principle of

  • Question 3
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    Comb types (single, rose, pea and walnut) of chickens follow supplementary gene interaction, where F2 generation shows segregation in the ratio of 9 walnut-combed : 3 pea-combed : 3 rose combed : 1 single-combed, when the 2 walnut-combed F1 individuals are mated. Such a cross illustrates the kind of gene interaction when

  • Question 4
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    Mendel studied the breeding experiment dealing with two characters at the same time (form of the seed and colour of the cotyledons), which led him to formulate the

  • Question 5
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    Hymenopterous insects show a unique phenomenon called haplodiploidy, where the sex of the offspring is determined by the

  • Question 6
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    The principle of linkage was put forward as a regular concept by Morgan in 1910 from his work on Drosophila melanogaster and noted that in a di-hybrid test cross involving complete linkage of genes, the frequency of

  • Question 7
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    Consider a monohybrid cross in pea plants, where a pure tall pea plant is crossed with a pure dwarf pea plant. All of the F1 offspring from the cross are tall. What would be the percentage of genotypes and phenotypes if one of the tall F1 plants is crossed with a pure dwarf pea plant?

  • Question 8
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    Identify the characteristic feature pertaining to X-linked inheritance which is not true.

  • Question 9
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    Protanopia and deuteranopia have been described by Horner (1876) and are diseases that are more often found in man. These are the examples of

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