Learning objective
Explain that a dominant allele is expressed if one copy 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 dominant allele is expressed if one copy is present
- This point belongs to Reproduction, especially Genetic inheritance.
- You need to be able to explain that a dominant allele is expressed if one copy is present.
- The key ideas to know are allele and dominant.
- 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 is a dominant allele is expressed if one copy is present?
Direct answer
In Biology, this page helps you answer questions about a dominant allele is expressed if one copy 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 dominant allele and genotype.
Key terms
- dominant allele: An allele that is expressed in the phenotype when at least one copy is present in the genotype.
- genotype: The genetic constitution of an individual, specifically the alleles present for a particular gene.
Common trap
Misinterpreting Dominance: Clarify that a dominant allele is expressed whenever it is present in at least one copy of a gene pair; the presence of a single dominant allele is sufficient for the dominant phenotype, regardless of the other allele’s type.
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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