In an investigation, a treatment causes the progesterone-producing structure in an ovary to remain active for six extra days after an egg is not fertilised.
The table shows the mean hormone concentrations on day 28.
| Group | Progesterone concentration (ng/mL) | FSH concentration (IU/L) |
|---|---|---|
| untreated | 1 | 8 |
| treated | 9 | 3 |
Use the data to explain why menstruation and the maturation of the next egg are both likely to occur later in the treated group.
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.