Principles of Inheritance and Variation


  1. Out of 8 ascospores formed in Neurospora the arrangement is 2a: 4a: 2a showing









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    In Neurospora, products of meiosis remain linearly arranged and undergo one mitosis. Crossing over occurs in four strand stage.

    Correct Option: C

    In Neurospora, products of meiosis remain linearly arranged and undergo one mitosis. Crossing over occurs in four strand stage.


  1. A child of O-group has B-group father. The genotype of father will be









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    The genotype of the child would be IºIº (recessive). Hence the genotype of the father can only be IBIO.

    Correct Option: D

    The genotype of the child would be IºIº (recessive). Hence the genotype of the father can only be IBIO.



  1. An allele is dominant if it is expressed in









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    Dominant alleles expresses itself in the homozygous as well as heterozygous condition. It is denoted by capital letter.

    Correct Option: A

    Dominant alleles expresses itself in the homozygous as well as heterozygous condition. It is denoted by capital letter.


  1. A gene pair hides the effect of another. The phenomenon is









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    Epistasis is the phenomenon of masking or supressing the phenotypic impression of a gene pair by a non allelic gene pair which impresses its own effect.

    Correct Option: A

    Epistasis is the phenomenon of masking or supressing the phenotypic impression of a gene pair by a non allelic gene pair which impresses its own effect.



  1. In a cross between AABB × aabb, the ratio of F2 genotypes between AABB, AaBB, Aabb and aabb would be









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    Genotype is the genetic make up of an individual irrespective of the mendelian characters or genes impressing.

    Correct Option: C

    Genotype is the genetic make up of an individual irrespective of the mendelian characters or genes impressing.