CHAPTER- 4: PRINCIPLES OF INHERITANCE AND VARIATION
EXERCISES
1. Mention the advantages of selecting pea plant for experiment by Mendel.
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2. Differentiate between the following –
(a) Dominance and Recessive
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(b) Homozygous and Heterozygous
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(c) Monohybrid and Dihybrid.
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3. A diploid organism is heterozygous for 4 loci, how many types of gametes
can be produced?
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4. Explain the Law of Dominance using a monohybrid cross.
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5. Define and design a test-cross.
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6. Using a Punnett Square, workout the distribution of phenotypic features
in the first filial generation after a cross between a homozygous female
and a heterozygous male for a single locus.
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7. When a cross in made between tall plant with yellow seeds (TtYy) and
tall plant with green seed (Ttyy), what proportions of phenotype in the
offspring could be expected to be
(a) tall and green.
(b) dwarf and green.
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8. Two heterozygous parents are crossed. If the two loci are linked what
would be the distribution of phenotypic features in F1generation for adibybrid cross?
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9. Briefly mention the contribution of T.H. Morgan in genetics.
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10. What is pedigree analysis? Suggest how such an analysis, can be useful.
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11. How is sex determined in human beings?
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12. A child has blood group O. If the father has blood group A and mother
blood group B, work out the genotypes of the parents and the possible
genotypes of the other offsprings.
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13. Explain the following terms with example
(a) Co-dominance
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(b) Incomplete dominance
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14. What is point mutation? Give one example.
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15. Who had proposed the chromosomal theory of the inheritance?
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16. Mention any two autosomal genetic disorders with their symptoms.
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DABP006892
