Who this is for: Cambridge IGCSE Coordinated Science (0654) students who want asexual and sexual reproduction — clones, gametes and fertilisation — to become reliable marks instead of vague “one parent vs two” answers.
What query it owns: how to understand and revise asexual and sexual reproduction in Cambridge IGCSE Coordinated Science.
Why this is safe: this page owns the asexual-and-sexual-reproduction revision-guide angle, while Tutopiya’s Asexual and Sexual Reproduction subtopic page owns the learning resource and the free Asexual and Sexual Reproduction quiz owns the practice.

Asexual and sexual reproduction are the two main ways organisms produce offspring. Cambridge IGCSE Coordinated Science (0654) tests whether you can define each type, link asexual reproduction to mitosis and clones, explain gametes and fertilisation in sexual reproduction, and compare advantages and disadvantages. This guide covers the syllabus definitions, comparison tables examiners expect, and the question types that appear every year.

Key takeaways

• Asexual reproduction involves one parent, no gamete fusion, and genetically identical offspring (clones).
• Sexual reproduction involves gametes fusing at fertilisation to form a zygote with genetic variation.
• Asexual reproduction relies on mitosis; sexual reproduction uses meiosis to form haploid gametes.
• Asexual advantages: rapid, needs one parent, preserves successful traits.
• Sexual advantages: variation helps populations survive environmental change and disease.

What are asexual and sexual reproduction in Cambridge IGCSE Coordinated Science?

Asexual reproduction produces offspring from a single parent without fusion of gametes. The offspring are clones because they arise from mitosis. Sexual reproduction involves the fusion of male and female gamete nuclei at fertilisation, producing a zygote that develops into a new organism with a mix of alleles from two parents. Coordinated Science papers often ask you to compare both types in one question.

Read the full notes on Tutopiya’s Asexual and Sexual Reproduction subtopic page before attempting questions.

The core ideas you must master

Idea	What it means	How the exam uses it
Clone	Genetically identical offspring	”State why offspring are clones.”
Gamete	Haploid sex cell	”Define gamete.”
Fertilisation	Fusion of gamete nuclei	”Describe fertilisation.”
Mitosis	Division producing identical cells	”Name the division in asexual reproduction.”
Variation	Differences between offspring	”Explain an advantage of sexual reproduction.”

Asexual vs sexual reproduction — comparison table

Feature	Asexual reproduction	Sexual reproduction
Parents	One	Two (usually)
Gametes	No fusion	Male and female gametes fuse
Offspring	Genetically identical (clones)	Genetically different
Cell division	Mitosis	Meiosis (gametes) + mitosis (growth)
Speed	Faster	Slower
Examples	Bacteria, yeast budding, strawberry runners	Humans, flowering plants, fish

Examples of asexual reproduction

Organism	Method	What happens
Bacteria	Binary fission	Cell divides into two identical cells
Yeast	Budding	Small outgrowth separates as new organism
Strawberry	Runners	Horizontal stem produces new plant
Potato	Tubers	Underground stem grows new shoots

Reproduction in past-paper wording

Command word	What the question wants	Typical stem
Define	Precise definition	”Define asexual reproduction.”
State	Short fact	”State one advantage of sexual reproduction.”
Describe	Process steps	”Describe binary fission in bacteria.”
Compare	Similarities and differences	”Compare asexual and sexual reproduction.”
Explain	Cause and effect	”Explain why clones are vulnerable to disease.”

Worked exam-style stems

1. “Define asexual reproduction.” Asexual reproduction is reproduction involving a single parent without the fusion of gametes, producing genetically identical offspring. Reward: single parent + no gamete fusion + identical offspring.
2. “Define fertilisation.” Fertilisation is the fusion of the nuclei of a male gamete and a female gamete. Reward: fusion + nuclei + male and female gamete.
3. “Compare asexual and sexual reproduction.” Asexual: one parent, no gametes, clones, faster. Sexual: two parents, gametes fuse, variation, slower. Reward: at least two valid differences with linked features.

Practise on the Asexual and Sexual Reproduction quiz.

How reproduction connects to the syllabus

This topic links to Sexual Reproduction in Plants, Sexual Reproduction in Humans and Cell Division. The Cambridge IGCSE Coordinated Science resource hub links every Reproduction subtopic.

Common mistakes students make

• Saying asexual reproduction involves two parents.
• Confusing mitosis with meiosis in reproduction answers.
• Omitting genetically identical in asexual define answers.
• Describing fertilisation without naming gamete nuclei.
• Ignoring variation as the main advantage of sexual reproduction.

When you need more support

If compare questions keep costing marks, work through the Asexual and Sexual Reproduction quiz, then get help from a Cambridge IGCSE Coordinated Science tutor.

Frequently asked questions

What is the difference between asexual and sexual reproduction? Asexual reproduction uses one parent and no gamete fusion, producing clones; sexual reproduction involves two parents and fusion of gametes, producing variation.

Why are asexual offspring called clones? They are genetically identical to the parent because they arise from mitosis without new allele combinations from gametes.

What is fertilisation? The fusion of the nuclei of a male gamete and a female gamete to form a zygote.

How do I revise asexual and sexual reproduction effectively? Learn both definitions, memorise the comparison table, link to mitosis and meiosis, then take the quiz.

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