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

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 Multiple Choice QuestionsShort 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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32. Write the various conclusions and hereditary principles drawn by Mendel from a monohybrid cross.
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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.
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36. Differentiate gene and allele.
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37. Explain the terms (a) Pure line and (b) Reciprocal cross.


(a) Pure line- is one which breeds true that is they undergo self pollination and show no variation in trait inheritance and expression.

(b) Reciprocal cross. These crosses involve the crosses concerning the same characters but with reversed sexes. It means if in a cross,  A is used as female parent and B as a male parent, then in 2nd cross  or reciprocal cross A will be used as male parent and B as female parent. Reciprocal cross is generally used to dtermine the contribution of sexes in inheritance pattern.

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 Multiple Choice QuestionsLong 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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 Multiple Choice QuestionsShort Answer Type

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