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2 marksPatterns of Inheritance

CAPE Biology Unit 1 · 2014 · Paper 2 · Question 2(b)(i)

In humans, the A, B, O blood groups are determined by multiple alleles of a single gene. The gene locus is usually represented by the symbol I and the blood genotypes may be represented as follows: IAIA or IAi = blood group A IBIB or IBi = blood group B ii = blood group O IAIB = blood group AB

Briefly explain the nature of the relationship between the alleles in the AB blood group.

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  1. 2(a)(i)Complete Table 1 by writing the correct answers in the relevant spaces in the table.[4 marks]
  2. 2(a)(ii)In the box labelled A in Figure 2, sketch a diagrammatic representation of the tRNA molecule carrying the next amino acid to be added to the growing…[3 marks]
  3. 2(b)(ii)a)Deduce the blood genotype of the accused male which will clearly prove that he is NOT the father of the child. Give a brief explanation to justify your answer.…[3 marks]
  4. 2(b)(ii)b)If the male parent in (b) (ii) a) above has blood type B, demonstrate the inheritance of the blood type (O) of the child. Use the given symbols and a Punnett…[3 marks]

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