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. Diploid chromosome number in humans is








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    Chromosomes occur in homologous pairs. Somatic cells have diploid number of chromosomes. Humans have 23 pairs i.e. 46 chromosomes. 22 pairs of autosomes and 1 pair of sex chromosomes ie. XX in females and XY in males.

    Correct Option: A

    Chromosomes occur in homologous pairs. Somatic cells have diploid number of chromosomes. Humans have 23 pairs i.e. 46 chromosomes. 22 pairs of autosomes and 1 pair of sex chromosomes ie. XX in females and XY in males.

  1. Bateson used the terms coupling and repulsion for linkage and crossing over. Name the correct parent of coupling type alongwith its cross repulsion








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    Bateson and Punnett (1906) discovered coupling and repulsion in sweet pea (Lathyrus odoratus).

    Correct Option: D

    Bateson and Punnett (1906) discovered coupling and repulsion in sweet pea (Lathyrus odoratus).

  1. Both husband and wife have normal vision though their fathers were colour blind. The probability of their daughter becoming colour blind is








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    The probability of the daughter becoming colour blind arises only when the father is also colour blind.

    So, probability of their daughter becoming colour blind is 0%.

    Correct Option: A

    The probability of the daughter becoming colour blind arises only when the father is also colour blind.

    So, probability of their daughter becoming colour blind is 0%.

  1. Cross between AaBB and aaBB will form








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    AaBB × aaBB on crossing gives 50% individuals having genotype AaBB and 50% individuals having genotype aaBB.

    Correct Option: A

    AaBB × aaBB on crossing gives 50% individuals having genotype AaBB and 50% individuals having genotype aaBB.

  1. In a genetic cross having recessive epistasis, F2 phenotypic ratio would be








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    In recessive epistasis, the recessive alleles suppress the expression of a trait. Recessive epistasis is a type of intergenic interaction in which one non allelic gene can produce its effect independently in the dominant state but second gene can produce its effect when they are present together. Here homozygous recessive allele for a gene mask the expression of dominant allele of another gene.

    Correct Option: C

    In recessive epistasis, the recessive alleles suppress the expression of a trait. Recessive epistasis is a type of intergenic interaction in which one non allelic gene can produce its effect independently in the dominant state but second gene can produce its effect when they are present together. Here homozygous recessive allele for a gene mask the expression of dominant allele of another gene.