Learning objective
Explain that a recessive allele is expressed only when two copies are present and no dominant allele is present.
Read the explanation, check the common trap, then practise with flashcards and questions.
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Topic
Reproduction
Subtopic
Genetic inheritance
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Understand this objective
Quick explanation
Explain that a recessive allele is expressed only when two copies are present and no dominant allele is present
- This point belongs to Reproduction, especially Genetic inheritance.
- You need to be able to explain that a recessive allele is expressed only when two copies are present and no dominant allele is present.
- The key ideas to know are dominant, allele, and recessive.
- Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.
Key concepts
Why it matters
This objective helps connect Genetic inheritance to exam-style questions, flashcards, and revision notes for Reproduction.
Quick student answer
What are a recessive allele is expressed only when two copies are present and no dominant allele is present?
Direct answer
In Biology, this page helps you answer questions about a recessive allele is expressed only when two copies are present and no dominant allele is present within Reproduction. Focus on the key process, correct scientific terms, and how the idea links to exam-style questions. Key terms to check are recessive allele and dominant allele.
Key terms
- recessive allele: A form of a gene that is only expressed when an individual has two copies and no dominant allele is present.
- dominant allele: A form of a gene that is expressed when at least one copy is present, masking the effect of a recessive allele.
Common trap
Misunderstanding Recessive Alleles: Emphasize that a recessive allele is only expressed when two copies are present and no dominant allele is present.
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Revision notestopic notes
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Open revision notesRelated learning objectives
- Describe sexual reproduction as the joining or fusion of male and female gametes.
Sexual and asexual reproduction
- Identify sperm and egg cells as animal gametes and pollen and egg cells as flowering plant gametes.
Sexual and asexual reproduction
- Explain that sexual reproduction mixes genetic information and produces variation in offspring.
Sexual and asexual reproduction
- State that gamete formation in sexual reproduction involves meiosis.
Sexual and asexual reproduction
- Describe asexual reproduction as reproduction involving one parent, no gamete fusion and no mixing of genetic information.
Sexual and asexual reproduction