Inheritance & EvolutionVery High Exam FrequencyAQAEdexcelOCRWJEC
Genetic Inheritance
Genetic inheritance patterns, alleles, and inheritance diagrams
What you'll cover
- Dominant and recessive alleles
- Homozygous and heterozygous genotypes
- Inheritance diagrams and Punnett squares
- Phenotype and genotype relationships
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Sample Flashcards
What is a dominant allele?
An allele that is always expressed in the phenotype, even if only one copy is present. Represented by a capital letter (e.g. B). Think of it as the 'bossy' allele.
What is a recessive allele?
An allele that is only expressed when two copies are present (homozygous recessive). Represented by a lower-case letter (e.g. b). It is 'hidden' by a dominant allele.
Sample Questions
What is the term for an allele that is always expressed when present?
What is the purpose of a Punnett square in genetic inheritance?
25
exam-style questions
25
revision flashcards
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