Describe the events that occur from ovulation to implantation in the human female reproductive system.

Cambridge International IGCSE Biology (0610) — 16.4 Sexual reproduction in humans · Describe · 4 marks · View as Markdown

Written & reviewed by James Millett — Biology (Imperial College London), PGCE Science (University of Cambridge).

Model answer (4 marks)

1. Ovulation releases an egg cell from the ovary.
2. The egg travels through the oviduct towards the uterus.
3. Fertilisation occurs in the oviduct when a sperm nucleus fuses with the egg nucleus.
4. The fertilised egg (zygote/embryo) divides and implants into the uterine lining.

Examiner tips

Use the exact sequence of events; each point counts for one mark.
Mention fertilisation in the oviduct and implantation into the uterus.
Keep the answer concise and use the terminology "ovulation", "oviduct", "zygote", "implantation".
Avoid extra details that are not asked for.

Common mistakes

Mixing up the order of events (e.g., stating implantation before fertilisation).
Using vague terms like "egg is released" without specifying ovulation.
Including unnecessary information such as hormonal regulation or the menstrual cycle.

Mark scheme (4 marks)

An egg cell is released from the ovary (ovulation).
The egg cell travels along the oviduct towards the uterus.
Fertilisation occurs in the oviduct when a sperm cell nucleus fuses with the egg cell nucleus.
The fertilised egg (zygote / embryo) divides and implants into the lining of the uterus.

Key terms in this question

ovulation · implantation