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3 marksGenetic Concepts

CSEC Biology · January 2012 · Paper 2 · Question 3(d)

A horticulturalist has a crop of plants that produces both red and white flowers. However, more red flowers are produced than white. A red-flowered plant is crossed with a white-flowered plant and the offspring produced are in the ratio 1 red to 1 white. Using the symbols R for red and r for white, draw a genetic diagram to illustrate this ratio.

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Other parts of this question

  1. 3(a)Complete Table 2 to show how sex is inherited in humans.[3 marks]
  2. 3(b)(i)Label the parts in Figure 3 where sex cells/gametes are found.[2 marks]
  3. 3(b)(ii)Outline the process by which gametes are formed.[2 marks]
  4. 3(b)(iii)If a plant has a diploid chromosome number of 8, how many chromosomes would be found in its gametes?[1 mark]
  5. 3(c)Suggest TWO ways in which the process of meiosis may be useful to plants.[2 marks]
  6. 3(e)John and Jake grew plants with the same genotype. Jake's plants produced smaller flowers than John's plants. Account for the difference in size of these…[2 marks]

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