Botany - Classical Genetics Book Back Questions

12th Standard EM

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Biology

Time : 00:45:00 Hrs
Total Marks : 30
    5 x 1 = 5
  1. Extra nuclear inheritance is a consequence of presence of genes in

    (a)

    Mitrochondria and chloroplasts

    (b)

    Endoplasmic reticulum and mitrochondria

    (c)

    Ribosomes and chloroplast

    (d)

    Lysososmes and ribosomes

  2. In Mendel’s experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the F2 generation of the cross RRYY x rryy?

    (a)

    Only round seeds with green cotyledons

    (b)

    Only wrinkled seeds with yellow cotyledons

    (c)

    Only wrinkled seeds with green cotyledons

    (d)

    Round seeds with yellow cotyledons an wrinkled seeds with yellow cotyledons

  3. Test cross involves

    (a)

    Crossing between two genotypes with recessive trait

    (b)

    Crossing between two F1 hybrids

    (c)

    Crossing the F1 hybrid with a double recessive genotype

    (d)

    Crossing between two genotypes with dominant trait

  4. Select the correct statement from the ones given below with respect to dihydrid cross

    (a)

    Tightly linked genes on the same chromosomes show very few combinations

    (b)

    Tightly linked genes on the same chromosomes show higher combinations

    (c)

    Genes far apart on the same chromosomes show very few recombinations

    (d)

    Genes loosely linked on the same chromosomes show similar recombinations as the tightly linked ones

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

    (a)

    Incomplete dominance

    (b)

    Law of dominance

    (c)

    Inheritance of one gene

    (d)

    Co-dominance

  6. 3 x 2 = 6
  7. Name the seven contrasting traits of Mendel.

  8. What is meant by true breeding or pure breeding lines / strain?

  9. Define Genetics.

  10. 3 x 3 = 9
  11. What are multiple alleles?

  12. Explain the law of dominance in monohybrid cross.

  13. What is meant by cytoplasmic inheritance

  14. 2 x 5 = 10
  15. Describe dominant epistasis with an example.

  16. Explain with an example how single genes affect multiple traits and alleles the phenotype of an organism.

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