(a)[4]
State the names of the parts marked A-D in Fig. 3.1.
(b)[4]
Outline the biological basis behind the effect of the oestrogen/progesterone contraceptive pill.
(c(i))[3]
Explain how preventing expression of the gene coding for ZP3 acts as a contraceptive.
(c(ii))[2]
Explain why it is desirable to develop a contraceptive method that does not use oestrogen and progesterone.
(c(iii))[2]
Explain why it is important, when the expression of the gene coding for ZP3 is blocked, that ZP3 is found only in the zona pellucida.