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1 markPatterns of Inheritance

CAPE Biology Unit 1 · 2013 · Paper 2 · Question 2(a)(iv)

In a cross between a plant with purple flowers and a plant with white flowers, all the F₁ plants had purple flowers. When the F₁ offspring were crossed (selfed), 705 plants had purple flowers and 224 plants had white flowers.

Determine the number of degrees of freedom. Show your calculation.

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  1. 2(a)(i)State the expected ratio for the cross of the F₁ offspring.[1 mark]
  2. 2(a)(ii)State an appropriate null (H₀) hypothesis and an appropriate alternative (H₁) hypothesis for a Chi-square test of the results.[2 marks]
  3. 2(a)(iii)Complete Table 2 by calculating the missing values.[4 marks]
  4. 2(a)(v)Using the Chi-square values in Table 3, comment on the validity of the null hypothesis stated on page 5.[2 marks]
  5. 2(b)(i)What is the term used to describe EACH group of three bases on the mRNA and tRNA?[1 mark]
  6. 2(b)(ii)Using the mRNA strand below, identify the corresponding triplet bases on the tRNA molecules. Write your answer in the boxes provided. Hint: Begin at the 5′…[2 marks]
  7. 2(b)(iii)Outline the nucleotide sequence on the DNA strand which serves as the template for the mRNA strand in (b) (ii).[2 marks]

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