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Linkage is of two types :

(A) Complete Linkage. In this case, two or more gene are always inherited together and there is no recombination.

(B) Incomplete Linkage. In this case the genes may not be inherited together and recombination occurs in them.

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

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

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57. What do you understand by the term recombination ?

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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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60. What are mutations ? Define.

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