Q8. (1) Complete the following genetic diagram to show how parents who did not suffer from haemophilia, could have a son wit h haemophilia but also other children who did not suffer from haemophilia. Genotype of parents Genotype of gametes Phenotype of parents Normal male Normal female Genotype of offspring Phenotype of offspring (1) What is the probability of the couple having a daughter with haemophilia? What is the probability of the couple having another son with haemophilia?

Question 21 Glycogen that is stored in skeletal muscle cells is broken down and released into the blood to maintain blood glucose during exercise can only be used by the contracting muscle itself during exercise O is rarely used for energy (ATP) production in muscle during exercise O two of the above are correct

QUESTION 20 The globin group of hemoglobin is made up of: O iron O bilirubin O bile O amino acids O DNA

QUESTION 15 The hormone insulin enhances the transport of glucose into most of the body's cells. Insulin secretion is controlled by a negative- feedback system between the concentration of glucose in the blood (stimulus) and the cells that secrete insulin (response). Which of the following statements is correct? A decrease in blood glucose concentration will stimulate insulin secretion, which will in turn increase the blood glucose concentration. An increase in blood glucose concentration will stimulate insulin secretion, which will in turn increase the blood glucose concentration still further. O A decrease in blood glucose concentration will stimulate insulin secretion, which will in turn lower the blood glucose concentration still further. An increase in blood glucose concentration will stimulate insulin secretion, which will in turn lower the blood glucose concentration.