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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 ?

Dihybrid cross. A cross in which two characters are taken into consideration is called dihybrid cross. It involves cross between plants differing in two traits For eg. - A cross between a pea plant with round and yellow seeds (RRYY) and a pea plant with wrinkled and green seeds (rryy) is considered to be a dihybrid cross as it involves two traits seed shape and seed color.

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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.

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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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