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3 marksGenetic Concepts

CSEC Biology · January 2014 · Paper 2 · Question 2(b)(i)a)

Albinism is characterized by a lack of melanin in the skin. A person with an albino phenotype has genotype, aa.

State what is meant by EACH of the following terms: Allele

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Other parts of this question

  1. 2(a)(i)Name the structures labelled A, B, C and D shown in Figure 2.[4 marks]
  2. 2(a)(ii)Melanin is a pigment that protects the skin from damage by UV light. Which structure in Figure 2 has the LARGEST quantities of this pigment?[1 mark]
  3. 2(b)(i)b)State what is meant by EACH of the following terms: Genotype[3 marks]
  4. 2(b)(i)c)State what is meant by EACH of the following terms: Phenotype[3 marks]
  5. 2(b)(ii)Using a genetic diagram, explain how two non-albino parents could produce an albino offspring.[6 marks]
  6. 2(b)(iii)Suggest the genotypes of parents who will never have albino children.[1 mark]

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