GCSE Biology Inheritance Revision Notes
Master GCSE 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 their offspring. It determines traits such as eye color, height, and many other characteristics. Understanding inheritance helps us learn how traits are inherited and how genetic variation occurs.
Key Concepts
- 1Genes are units of heredity that determine traits.
- 2Alleles are different versions of a gene.
- 3Dominant alleles mask the effects of recessive alleles.
- 4Homozygous means having two identical alleles, while heterozygous means having two different alleles.
- 5Punnett squares can be used to predict the probability of offspring inheriting certain traits.
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. If a dominant allele is present, it will show in the offspring, while recessive alleles only show if both alleles are recessive. This process helps create variation in traits among individuals.
Memory Trick
“Remember 'DHH' for Dominant, Homozygous, and Heterozygous to keep the key concepts of inheritance in mind.”
Flashcards
What is a gene?
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Exam Questions
Describe and explain the process of inheritance in humans. [6 marks]
6 marksView mark scheme hint▾
Include definitions of genes and alleles, the role of dominant and recessive alleles, and examples of traits.
Explain how a Punnett square can be used to predict genetic outcomes. [4 marks]
4 marksView mark scheme hint▾
Discuss the setup of a Punnett square, the parental genotypes, and how to interpret the results.
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 term for different versions of a gene?
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