2023TrialShort answer

Q31 (b)

2 marks

Question

The graph below shows how the levels of three hormones change during pregnancy.
How does the source of progesterone change as pregnancy progresses?

Try the question before revealing the answer.

Solution

Criteria	Marks
Identifies the early and later sources.	2
Identifies one source.	1

Sample answer:

Progesterone is initially produced by the corpus luteum, but as the placenta develops, at approx the end of the first trimester, it takes over as the source of progesterone.

Supplied marking guidance · human reviewed

Compare this with your working, not only your final sentence.

Syllabus alignment

Module 5 · Heredity

ReproductionAnalyse fertilisation, implantation and hormonal control of mammalian pregnancy and birth.

Spot a problem? Send feedback