Quelpr
3 marksGenetic Variation and Speciation

CSEC Biology · January 2019 · Paper 2 · Question 3(e)

Two sisters, ages 15 and 16, have the same biological parents and were brought up under the same conditions. The 15-year-old is much taller than the 16-year-old.

Suggest THREE events which take place during sexual reproduction which may have led to the variation in the height of the two sisters.

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)(i)Complete the genetic diagram below to show how this is possible.[4 marks]
  7. 3(d)(ii)What is the genotype of the child with blood group O?[1 mark]

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