OCR Biology Inheritance Revision Notes
Master OCR 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 genes, which determine traits and characteristics in living organisms.
Key Concepts
- 1Genes are segments of DNA that code for specific traits.
- 2Alleles are different versions of a gene that can result in variation in traits.
- 3Mendelian inheritance includes concepts such as dominant and recessive alleles.
- 4Punnett squares are used to predict the probability of offspring inheriting certain traits.
- 5Genetic variation is essential for evolution and adaptation.
Simple Explanation
Inheritance is how traits are passed down from parents to their children through genes. Each gene can have different versions called alleles, which can be dominant or recessive. This means that some traits can be more likely to show up in offspring than others. Understanding inheritance helps us predict how traits will appear in future generations.
Memory Trick
“Remember 'D.O.G.' for Dominant, Offspring, Genes to recall the key elements of inheritance.”
Flashcards
What is a gene?
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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, examples of monohybrid crosses, and Punnett squares.
Explain how genetic variation occurs in a population. [4 marks]
4 marksView mark scheme hint▾
Discuss mutations, sexual reproduction, and gene flow.
What is meant by the term 'phenotype'? [2 marks]
2 marksView mark scheme hint▾
Define phenotype and give examples of traits.
Practice Quiz
What is the term for different versions of a gene?
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