Sexual reproduction in humans
Cambridge IGCSE Biology (0610) · Unit 16: Reproduction · 12 flashcards
Sexual reproduction in humans is topic 16.4 in the Cambridge IGCSE Biology (0610) syllabus , positioned in Unit 16 — Reproduction , alongside Asexual reproduction, Sexual reproduction and Sexual reproduction in plants. In one line: Fertilization is the fusion of a sperm nucleus (male gamete) with an egg cell nucleus (female gamete). This fusion creates a zygote, the first cell of the new organism containing a full set of chromosomes.
This topic is examined in Paper 1 (multiple-choice) and Papers 3/4 (theory), plus Paper 5 or Paper 6 (practical / alternative to practical). Past papers from 2022 to 2025 show this topic across 16 questions worth 185 marks (around 2.7% of all Biology marks in those years).
The deck below contains 12 flashcards — 1 definition, 5 key concepts, 1 process card and 5 identification cards — covering the precise wording mark schemes reward. Use the definition card to lock down command-word answers (define, state), then move on to the concept and application cards to handle explain, describe and compare questions.
Describe fertilization in humans
Fertilization is the fusion of a sperm nucleus (male gamete) with an egg cell nucleus (female gamete). This fusion creates a zygote, the first cell of the new organism containing a full set of chromosomes.
What the Cambridge 0610 syllabus says
Official 2026-2028 specThese are the exact learning objectives Cambridge sets for this topic. Match the command word (Describe, Explain, State, etc.) in your answer to score full marks.
- Identify Identify on diagrams and state the functions of the following parts of the male reproductive system: testes, scrotum, sperm ducts, prostate gland, urethra and penis
- Identify Identify on diagrams and state the functions of the following parts of the female reproductive system: ovaries, oviducts, uterus, cervix and vagina
- Describe Describe fertilisation as the fusion of the nuclei from a male gamete (sperm) and a female gamete (egg cell)
- Explain Explain the adaptive features of sperm, limited to: flagellum, mitochondria and enzymes in the acrosome
- Explain Explain the adaptive features of egg cells, limited to: energy stores and the jelly coat that changes at fertilisation
- Compare Compare male and female gametes in terms of: size, structure, motility and numbers
- State State that in early development, the zygote forms an embryo which is a ball of cells that implants into the lining of the uterus
- Identify Identify on diagrams and state the functions of the following in the development of the fetus: umbilical cord, placenta, amniotic sac and amniotic fluid
- Describe Describe the function of the placenta and umbilical cord in relation to the exchange of dissolved nutrients, gases and excretory products between the blood of the mother and the blood of the fetus Supplement
- State State that some pathogens and toxins can pass across the placenta and affect the fetus Supplement
What are the main parts of the male reproductive system and their functions?
The male reproductive system includes: Testes (produce sperm and testosterone), Scrotum (holds testes at optimal temperature), Sperm ducts (transport sperm), Prostate gland (secretes fluid for semen), Urethra (carries semen and urine), and Penis (delivers sperm).
What are the main parts of the female reproductive system and their functions?
The female reproductive system includes: Ovaries (produce egg cells and estrogen/progesterone), Oviducts (transport egg cells to uterus, site of fertilization), Uterus (where the embryo implants and develops), Cervix (lower part of uterus, opens to vagina), and Vagina (receives sperm).
Describe fertilization in humans.
Fertilization is the fusion of a sperm nucleus (male gamete) with an egg cell nucleus (female gamete). This fusion creates a zygote, the first cell of the new organism containing a full set of chromosomes.
What are the adaptive features of a sperm cell?
Sperm cells have: a Flagellum (tail) for motility, numerous Mitochondria to provide energy for swimming, and Enzymes in the acrosome to break down the egg's outer layers, allowing penetration for fertilization.
What are the adaptive features of an egg cell?
Egg cells contain Energy stores (nutrients) to nourish the developing embryo after fertilization, and a Jelly coat which changes its structure after fertilization to prevent more than one sperm from entering.
Compare the sizes of male and female gametes.
Egg cells are significantly larger than sperm cells. The large size of the egg cell is due to its large cytoplasm that contains energy stores for the developing embryo, whereas sperm cells are small and streamlined for motility.
How does a zygote develop after fertilization?
After fertilization, the zygote undergoes rapid cell division to form an embryo, a ball of cells. The embryo implants into the lining of the uterus where it continues to develop.
What are the functions of the umbilical cord?
The umbilical cord connects the fetus to the placenta. It contains blood vessels that transport oxygen, nutrients, and antibodies from the mother's blood to the fetus, and removes carbon dioxide and other waste products from the fetus's blood.
What are the functions of the placenta?
The placenta facilitates the exchange of dissolved nutrients, gases (oxygen and carbon dioxide), and excretory products between the mother's blood and the fetus's blood. It also produces hormones to maintain the pregnancy.
What are the functions of amniotic sac and amniotic fluid?
The amniotic sac is a membrane filled with amniotic fluid that surrounds and protects the fetus. The amniotic fluid cushions the fetus against impacts and allows it to move freely, aiding muscle and bone development.
Can pathogens or toxins cross the placenta?
Yes, some pathogens (
Compare motility of male and female gametes.
Sperm cells are motile, meaning they can move independently using their flagella. Egg cells are non-motile; they do not have the ability to move themselves and rely on the oviduct to transport them.
Key Questions: Sexual reproduction in humans
Describe fertilization in humans.
Fertilization is the fusion of a sperm nucleus (male gamete) with an egg cell nucleus (female gamete). This fusion creates a zygote, the first cell of the new organism containing a full set of chromosomes.
Tips to avoid common mistakes in Sexual reproduction in humans
- ● Always align the number of points you give with the mark allocation for the question, especially if it's three marks.
More topics in Unit 16 — Reproduction
Sexual reproduction in humans sits alongside these Biology decks in the same syllabus unit. Each uses the same spaced-repetition system, so progress in one informs the next.
Cambridge syllabus keywords to use in your answers
These are the official Cambridge 0610 terms tagged to this section. Mark schemes credit responses that use the exact term — weave them into your answers verbatim rather than paraphrasing.
Key terms covered in this Sexual reproduction in humans deck
Every term below is defined in the flashcards above. Use the list as a quick recall test before your exam — if you can't define one of these in your own words, flip back to that card.
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