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2 marksGenetic Concepts

CSEC Biology · January 2005 · Paper 2 · Question 5(a)(i)

Figure 5 shows in outline how a plant breeder developed a variety of a particular plant which had large leaves and large flowers. Both of the parent varieties (1 and 2) were true breeding (homozygous) for flower size.

What does the term 'homozygous' mean?

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Other parts of this question

  1. 5(a)(ii)Complete the genetic diagram below to show what happened the first time the two varieties were crossed, if small flowers are dominant to large flowers.[5 marks]
  2. 5(a)(iii)Why would the breeding programme have to continue for many generations?[1 mark]
  3. 5(b)(i)What is the advantage to a plant of having large flowers and large leaves?[2 marks]
  4. 5(b)(ii)What might be the advantage to the flower farmer of having a variety with BOTH large flowers and large leaves?[2 marks]
  5. 5(b)(iii)Give ONE other characteristic of the new flower variety that the flower farmer would want and say why it would be important to the farmer.[2 marks]

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