Biology 9700 · AS & A Level · Control and coordination in mammals
Control and coordination in mammals — practice question
A newer development in fertility treatment is called in-vitro maturation (IVM). This costs less and is safer than the standard method used in in-vitro fertilisation (IVF), particularly for women with polycystic ovaries. Hormone treatment can be hazardous for women with this condition, in which several ovarian follicles mature at the same time. IVF and IVM are compared in Fig. 3.1.
(a)[2]
With reference to Fig. 3.1, explain why women are given hormones for two weeks after drugs are used to suppress ovulation at the start of IVF treatment.
(b)[3]
State the roles of mitosis and meiosis in producing an immature secondary oocyte.
(c)[2]
Suggest one advantage and one possible disadvantage of fertilising an oocyte by injecting a sperm into its cytoplasm instead of mixing the oocyte with a sample of sperm.
Worked solution & mark scheme
This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Triggers superovulation” …