(a)[4]
Fig. 3.1 is a drawing of a section through an ovarian follicle. State the names of the parts labelled A-D in Fig. 3.1.
(b)[4]
Outline the biological basis of the action of the oestrogen/progesterone contraceptive pill.
(c(i))[3]
Explain how blocking expression of the gene that codes for ZP3 can act as a contraceptive.
(c(ii))[2]
Explain why it is desirable to devise a contraceptive method that does not use oestrogen and progesterone.
(c(iii))[2]
Explain why it is important, when blocking expression of the gene coding for ZP3, that ZP3 is found only in the zona pellucida.