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Principles of Inheritance and Variation

Short Answer Type

31.

Using a Punnett Square, work out 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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Long Answer Type

32. Write the various conclusions and hereditary principles drawn by Mendel from a monohybrid cross.

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Short Answer Type

33. What is a dihybrid cross ?

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34.

Briefly mention the contribution of T.H. Morgan in genetics.

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35. Write short note on biological significance of Mendel’s laws.

Mendel’s work of inheritance proved to be very useful in the field of genetics.
1. Mendel's Laws explained how genes are inherited by offsprings from their parents.
2. It explained the basis of variation and how offsprings differ from their parents.
The laws of Dominance , Segregation and 3.Independent assortment laid the foundation for chromosomal theory of inheritance and explained the various phenomenon in genetics.
4. It helped to understand the basics of inheritance and thus is used to improve the organisms.

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36. Differentiate gene and allele.

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37. Explain the terms (a) Pure line and (b) Reciprocal cross.

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Long Answer Type

38.

Define and design a test cross.

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39.

When a cross is made between tall plant with yellow seeds (TtYy) and tall plant with green seeds (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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Short Answer Type

40. Write a note on incomplete dominance. Cite one example.

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