Researchers studied a condition that reduces the amount of oestrogen released by a developing follicle. FSH concentration and egg maturation are unaffected.
The table shows mean results for cycles in people with and without the condition.
| Measurement | Without the condition | With the condition |
|---|---|---|
| oestrogen concentration on day 12 in pmol/L | 750 | 120 |
| highest LH concentration between days 12 and 15 in IU/L | 48 | 12 |
| increase in uterus lining thickness between days 5 and 13 in mm | 5.5 | 1.7 |
| cycles in which an egg was released in % | 94 | 20 |
Explain how the condition reduces the chance of pregnancy in two different ways. Use information from the table.
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.