AQA Biology Inheritance Revision Notes
Master AQA 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 can be dominant or recessive, influencing traits in the next generation.
Key Concepts
- 1Genes are located on chromosomes and determine inherited traits.
- 2Alleles can be dominant or recessive, affecting phenotype expression.
- 3Mendel's laws of inheritance describe how traits are inherited.
- 4Genotype refers to the genetic makeup, while phenotype refers to the observable traits.
- 5Punnett squares are used to predict the probability of offspring genotypes.
Simple Explanation
Inheritance is how parents pass on traits to their children through genes. Each gene can have different versions called alleles, which can be dominant or recessive. Dominant alleles can mask the effects of recessive ones, leading to different physical traits. Understanding inheritance helps explain why offspring may look like one parent more than the other.
Memory Trick
“Remember 'D-R-G-P' for Dominant-Recessive-Genotype-Phenotype to recall the key concepts of inheritance.”
Flashcards
What is a gene?
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Exam Questions
Describe and explain the process of inheritance in pea plants. [6 marks]
6 marksView mark scheme hint▾
Include Mendel's experiments, dominant and recessive traits, and the use of Punnett squares.
Explain how dominant and recessive alleles affect phenotype. [4 marks]
4 marksView mark scheme hint▾
Discuss the concept of dominance, examples of traits, and how alleles interact.
What is meant by the term 'homozygous'? [2 marks]
2 marksView mark scheme hint▾
Define homozygous and provide an example.
Practice Quiz
What is the physical expression of a trait called?
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