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10 marksNatural Selection

CAPE Biology Unit 1 · 2003 · Paper 2 · Question 8(a)

Describe the biological-species concept and state the limitations of this concept. Explain how new species are formed.

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  1. 8(b)Suggest how environmental factors act to preserve the alleles for both normal haemoglobin and sickle cell haemoglobin in native Africans living in Africa.[5 marks]
  2. 8(c)Discuss the advantages of sexual reproduction over asexual reproduction.[5 marks]

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