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2 marksCell Division and Variation

CAPE Biology Unit 1 · 2006 · Paper 2 · Question 2(a)(ii)

Figure 1 shows 5 cm lengths of plasticine, one white and one ink-coloured (blue or black), used as chromosome models. You are asked to conceptualize models of chromosomes during meiosis and draw them in the provided spaces. To distinguish between homologous chromosomes, leave the white plasticine clear and the ink-coloured plasticine with hashed lines.

Draw early anaphase of meiosis I, showing the exchanged chromatid material. (Shade appropriately).

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Other parts of this question

  1. 2(a)(i)Illustrate ONE pair of homologous chromosomes aligning themselves. Illustrate ONE cross-over between two of the chromatids.[2 marks]
  2. 2(b)With reference to Figure 2 above, complete Table 2 to show which areas of the sex chromosomes can cross over to form chiasmata. (Place a tick (√) in the…[2 marks]
  3. 2(c)State TWO ways in which the process of meiosis contributes towards the variation of the gametes.[2 marks]
  4. 2(d)Place a tick (√) in the column which shows the amount of DNA present at the stage of meiosis listed.[2 marks]

More practice: the rest of this paper · more Cell Division and Variation questions · all CAPE Biology Unit 1 past papers