A-Level Biology Inheritance Revision Notes
Master A-Level Biology Inheritance using simple revision notes, key facts and practice questions — all generated by AI for your exam.
Inheritance is the process by which genetic information is passed from parents to offspring. It involves the transmission of alleles, which determine traits, through mechanisms such as Mendelian inheritance and non-Mendelian inheritance patterns.
Key Concepts
- 1Mendelian inheritance involves dominant and recessive alleles.
- 2Genotypes determine phenotypes, which are the observable traits.
- 3Punnett squares can be used to predict offspring genotypes.
- 4Linkage and recombination affect inheritance patterns.
- 5Non-Mendelian inheritance includes incomplete dominance, codominance, and polygenic traits.
Simple Explanation
Inheritance is how traits and characteristics are passed down from parents to their children through genes. Each gene can have different versions called alleles, which can be dominant or recessive. The combination of alleles from both parents determines how the offspring will look and behave. Understanding inheritance helps explain why children may resemble their parents or have different traits.
Memory Trick
“Use the acronym 'GREAT' to remember key concepts: Genes, Recessive, Expression, Alleles, Traits.”
Flashcards
What is a dominant allele?
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Exam Questions
Describe and explain the process of Mendelian inheritance. [6 marks]
6 marksView mark scheme hint▾
Include definitions of dominant and recessive alleles, Punnett squares, and examples of monohybrid crosses.
Explain how polygenic traits differ from Mendelian traits. [4 marks]
4 marksView mark scheme hint▾
Discuss the involvement of multiple genes and the resulting phenotypic variation.
What is meant by the term 'allele'? [2 marks]
2 marksView mark scheme hint▾
Define allele and provide examples of how they relate to genes.
Practice Quiz
What type of inheritance involves one allele being completely dominant over another?
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