Use the information below to answer questions (a)(i) and (a)(ii).
    Hb Are presents normal haemoglobin, 
    HbS represents sickled haemoglobin.

a. A female heterozygote for sickle cell married a sickler.  With the aid of a genetic diagram, determine the:
    (i)  possible genotypes of their offspring;    [8  marks]
    (ii)  phenotypic ratio of the offspring.    [2  marks]

b. Explain briefly the reason why a Rhesus negative woman married to a Rhesus positive man might lose her second pregnancy.    [5 marks]

c. Name two examples of features in animals that support the theory of use and disuse of body parts as used by Lamarck.    [2 marks]

d. List three structures in mammals that are vestigial.    [3  marks]

a. Explain briefly the importance of the following factors and organisms in the nitrogen cycle
    (i)  lightning;    [3  marks]
    (ii)  Nitrosomonas; [2  marks]
    (iii)  Azotobacter.    [2  marks]

b. Name the excretory organ in:
    (i)  insects: [1  mark]
    (ii)  earthworm.

c. Define
    (i)  hepatitis;  [4  marks]
    (ii)  kidney stones    [4marks]

d.     (i) State three effects of lack of sense  receptors in the skin to humans.  [3 marks]
    (ii) List three layers of the epidermis in the skin of humans.    [3 marks]

e.    (i) What  is metamorphosis?  [2  marks]
    (ii) State the type of metamorphosis  exhibited by each of the following insects  listed in the table below.

a. Complete the table below.

    [6 marks]

b. List five parts of the alimentary canal of an earthworm.    [5 marks]

c. State six ways by which water could be polluted by agricultural practices.    [6 marks]

d. Describe briefly the life cycle of a housefly.    [5 marks]

e. Make a diagram, 6 cm – 8 cm long of the hypogeal germination in a mature maize seedling and label fully.    [8 marks]
 

The hormone which regulates the amount of glucose in the blood is called?

Deamination occurs in the?