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6 marksPatterns of Inheritance

CAPE Biology Unit 1 · 2007 · Paper 2 · Question 8(b)

In a cross between two types of pea plants, one heterozygous for the round yellow seed condition, and the other, pure-breeding with wrinkled green seeds, the following offsprings were recorded: Round yellow peas 108 Round green peas 102 Wrinkled yellow peas 105 Wrinkled green peas 101

Clarify the sequential steps to be taken when using the Chi-squared test to determine the significance of the results. The formula for conducting a Chi-squared test is X² = Σ(O-E)²/E

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Other parts of this question

  1. 8(a)(i)Explain the nature of inheritance of the allele for haemophilia.[14 marks]
  2. 8(a)(ii)Explain why none of Queen Victoria's female offsprings were haemophiliacs.[1 mark]
  3. 8(a)(iii)Draw a genetic diagram to show the inheritance of the haemophilia allele in the children of Leopold Duke of Albany.[1 mark]
  4. 8(a)(iv)Explain the inheritance of the human ABO blood group.[1 mark]

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