Learning objective
Use fully labelled genetic diagrams for monohybrid and dihybrid crosses.
Read the explanation, check the common trap, then practise with flashcards and questions.
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Topic
Genetics and ecosystems official content
Subtopic
Inheritance
Study support
Understand this objective
Quick explanation
Use fully labelled genetic diagrams for monohybrid and dihybrid crosses
- This point belongs to Genetics and ecosystems official content, especially Inheritance.
- You need to be able to use fully labelled genetic diagrams for monohybrid and dihybrid crosses.
- The key ideas to know are monohybrid and dihybrid.
- 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 Inheritance to exam-style questions, flashcards, and revision notes for Genetics and ecosystems official content.
Quick student answer
In a monohybrid cross between two heterozygous pea plants (Tt), what is the expected phenotypic ratio of the offspring?
Direct answer
The expected phenotypic ratio is 3:1.
Key terms
- Homozygous: An organism with two identical alleles for a specific trait.
- Heterozygous: An organism with two different alleles for a specific trait.
Common trap
Confusing Phenotype with Genotype: Remember that phenotype refers to the observable traits, while genotype refers to the genetic makeup.
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Flashcard prompts
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Revision notestopic notes
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Open revision notesRelated learning objectives
- Define genotype and phenotype.
Inheritance
- Use dominant, recessive, codominant, homozygous and heterozygous terminology.
Inheritance
- Interpret crosses involving sex-linkage, autosomal linkage, multiple alleles and epistasis.
Inheritance
- Use chi-squared testing to compare observed and expected phenotypic ratios.
Inheritance
- Define a population as organisms of the same species in a space and time that can potentially interbreed.
Populations