Using Fig. 3.1, state what cells are doing in process B.
Using Fig. 3.1, say what is occurring in the cells during process D.
Using Fig. 3.1, state what is occurring in the cells during process F.
Female gametes develop within follicles. Fig. 3.2 shows a section through a mature (Graafian) follicle in a human ovary. Table 3.1 below gives several statements about the mature follicle. Each statement is matched to one of the letters G, H, J and K shown in Fig. 3.2. Fill in the table using the letters G, H, J and K.
A man and a woman can be classed as infertile if conception has not occurred after 12 months of trying. They may choose in-vitro fertilisation (IVF) if the woman is producing some normal eggs. Outline the technique of IVF.
Not every pregnancy resulting from IVF ends in a live birth. In the USA in 2008 the data were: 85% of these pregnancies resulted in live births for women under 35 years old; 66% of these pregnancies resulted in live births for women aged 38-40 years old. Suggest reasons for the difference in percentage for the two groups of women.