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2 marksPatterns of Inheritance

CAPE Biology Unit 1 · 2008 · Paper 2 · Question 2(e)(ii)

The students used the Table of Chi-squared values shown in Table 3 to determine whether the value obtained in (d) indicates that the difference between the observed and expected results are acceptable or not acceptable as being due to chance alone.

The students checked the 5% probability in order to determine whether the result was significant or insignificant. What was their decision, and why?

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Other parts of this question

  1. 2(a)(i)State the genotype of the F1 plant.[1 mark]
  2. 2(a)(ii)State the phenotype of the F1 plant.[1 mark]
  3. 2(b)State the FOUR different combinations of the alleles carried in the gametes of this F1 dihybrid plant (plant produced in (a) above).[1 mark]
  4. 2(c)(i)Use the Punnett Square shown in Table 1 to show the genotypes of the F2 generation of this dihybrid cross.[2 marks]
  5. 2(c)(ii)Give the ratio of red : pink : white flowers.[3 marks]
  6. 2(d)Complete the Chi-squared calculation in Table 2 and the final Chi-squared sum using the formula provided.[4 marks]
  7. 2(e)(i)How did the students determine the degrees of freedom?[1 mark]
  8. 2(e)(iii)If the Chi-squared value had been 7.0, what information could have been gained concerning the results of the monohybrid cross experiment?[1 mark]

More practice: the rest of this paper · more Patterns of Inheritance questions · all CAPE Biology Unit 1 past papers