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6 marksCell Division and Genetics

CSEC Human and Social Biology · January 2014 · Paper 2 · Question 6(c)

Use a Punnett square to determine the genotypes of the offspring from a cross between a female carrier of red-green colour blindness (X^R X^r) and a normal male (X^R Y^-), and state the phenotype of EACH offspring.

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Other parts of this question

  1. 6(a)Distinguish between continuous and discontinuous variation, and give ONE example of EACH type.[4 marks]
  2. 6(b)Explain how the chromosome number of an individual with Down's syndrome differs from that of a normal person.[2 marks]
  3. 6(d)(i)Suggest the possible type of pollution resulting from cell phone towers erected close to residential homes.[1 mark]
  4. 6(d)(ii)Suggest a possible adverse effect of this pollution on humans.[1 mark]
  5. 6(d)(iii)Suggest an action humans could take to reduce the impact of this pollution.[1 mark]

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