A clinic collects 12 mature eggs after hormone treatment. Nine are fertilised, six develop into suitable embryos and one embryo is transferred.
What percentage of the collected eggs developed into suitable embryos, and why is pregnancy still uncertain?
75%; the transferred embryo still needs fertilisation
50%; the transferred embryo may fail to implant
75%; the transferred embryo may fail to implant
50%; the transferred embryo still needs fertilisation
90 exam-style questions on Edexcel GCSE Biology 7.2 Reproductive hormones, covering 7.2.1 Stages of the menstrual cycle, 7.2.2 Hormonal control of the menstrual cycle, 7.2.3 Hormonal contraception, 7.2.4 Evaluating contraception methods, and 7.2.5 Hormones in Assisted Reproductive Technology. Each one has a worked solution and a mark scheme showing where the marks go.