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3 marksCell Division and Genetics

CSEC Human and Social Biology · January 2013 · Paper 2 · Question 5(b)(i)

Haemophilia is a sex-linked disease; Mrs Trinbage is a carrier.

Explain what is meant by the term 'carrier'.

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Other parts of this question

  1. 5(a)Define the terms 'gene' and 'dominance'.[3 marks]
  2. 5(b)(ii)Complete the Punnett square for a cross between Mrs Trinbage (X^H X^h) and her husband, who is normal (X^H Y^H).[5 marks]
  3. 5(b)(iii)Describe the possible phenotypes of their offspring.[4 marks]

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