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6 In shorthorn cattle, the coat colours red or white are controlled by a single pair of alleles. A 

calf which receives the allele for red coat from its mother and the allele for white coat from its father is called a ‘roan’. It has an equal number of red and white hairs in its coat. 

  (a) Is this an example of codominance or of incomplete dominance? 

  (b) Give a reason for your answer.  

  (c) Give one example in each case of (i) codominance, (ii) incomplete dominance, in 

     humans. 

7 Give three examples of human disorders which are caused by the action of a single pair of 

alleles. In each case say whether the harmful allele is dominant or recessive to the 

non-harmful allele. 

8 In humans, maleness or femaleness is determined by a pair of sex chromosomes called 

X and Y. 

  (a) What is the genotype for males? 

  (b) What is the genotype for females? 

9 (a) In humans, is it the sperm or the ovum which determines the sex of the offspring? 

  (b) Give a reason for your answer. 

SCIENCE
HEALTH SCIENCE
NURSING

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