Quelpr
4 marksGenetic Concepts

CSEC Biology · January 2019 · Paper 2 · Question 3(d)(i)

A couple with blood groups A and B has a son with blood group O.

Complete the genetic diagram below to show how this is possible.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 3(a)(i)What is the effect on the expression of phenotype for continuous and discontinuous variation?[2 marks]
  2. 3(a)(ii)State how the data for continuous variation should be presented graphically.[1 mark]
  3. 3(b)(i)State ONE characteristic of human beings that shows continuous variation.[2 marks]
  4. 3(b)(ii)State ONE characteristic of human beings that shows discontinuous variation.[2 marks]
  5. 3(c)State TWO cellular components of blood.[2 marks]
  6. 3(d)(ii)What is the genotype of the child with blood group O?[1 mark]
  7. 3(e)Suggest THREE events which take place during sexual reproduction which may have led to the variation in the height of the two sisters.[3 marks]

More practice: the rest of this paper · more Genetic Concepts questions · all CSEC Biology past papers