Biology 9700 · AS & A Level · Passage of information from parents to offspring
Passage of information from parents to offspring — practice question
A recent advance in fertility treatment is known as in-vitro maturation (IVM). It is less expensive and safer than the usual procedure 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 that suppress ovulation are administered at the start of IVF treatment.
(b)[3]
State the roles that mitosis and meiosis have in forming an immature secondary oocyte.
(c)[2]
Suggest one advantage and one possible disadvantage of fertilising an oocyte by injecting a sperm into its cytoplasm rather than 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: “To promote superovulation” …