Principles Of Inheritance And Variation Worksheet - Class 12, Ws 5 Page 2

3 MARK QUESTIONS

10 Explain the pattern of inheritance of haemophilia in humans. Why is the possibility of a

human female becoming haemophilic extremely rare? Explain

11 Study the pedigree chart and answer the questions that follow.

III

a) Is the trait recessive or dominant?

b) Is the trait sex- linked or autosomal?

Give the genotypes of the parents in generation I and of their third and fourth child in

generation II

12 Study the pedigree chart and answer the questions that follow:

III

a) Is the trait recessive or dominant?

b) Is the train sex- linked or autosomal?

Give the genotypes of the parents shown in generation I and their third child shown in

generation II and the first grand child shown in generation III.

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