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Principles of Inheritance and Variation

Short Answer Type

51. What are types of linkage ?

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52. Explain Linkage Group.

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53. Differentiate between :

Complete linkage and incomplete linkage

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54. Define sex-linked genes?

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One Word Answers

55. Give the name for the Trisomy of 21^stchromosome in humans.

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Short Answer Type

56. Why is a man unable to pass on a X-linked trait to his son ?

A man has the sex chromosomes XY which makes him a hetrogametic. Fathers pass the X chromosome to their daughter and Y chromosome to his son. Thus the X-linked trait is not passed to the son because the son recieves the gamete having Y chromosome.

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57. What do you understand by the term recombination ?

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Long Answer Type

58.

How is sex determined in human beings?

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59.

What is pedigree analysis? Suggest how such an analysis can be useful?

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Short Answer Type

60. What are mutations ? Define.

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