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8 marksCell Division and Genetics

CSEC Human and Social Biology · May/June 2009 · Paper 2 · Question 11(c)(i)

Genetics of haemophilia and albinism.

Using a clearly labelled genetic diagram or Punnett square starting from carrier female (XH Xh) and normal male (XH Y-), show the genotypes and phenotypes of the offspring to demonstrate how haemophilia is passed to one of the children.

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Other parts of this question

  1. 11(a)Complete Table 1 to show THREE differences between mitosis and meiosis based on occurrence, chromosome number, and genetic variation.[3 marks]
  2. 11(b)(i)Give ONE example of continuous variation in human beings.[1 mark]
  3. 11(b)(ii)Give ONE example of discontinuous variation in human beings.[1 mark]
  4. 11(c)(ii)Identify which child, John or Jenny, inherited haemophilia, giving a reason for the answer.[2 marks]
  5. 11(d)Suggest ONE sign of haemophilia and describe how it can be treated.[2 marks]
  6. 11(e)(i)State whether albinism is caused by dominant or recessive alleles.[1 mark]
  7. 11(e)(ii)Suggest ONE distinguishing characteristic of an albino individual and ONE precaution they must take in daily life.[2 marks]

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