Inheritance and Genetics: Predicting the Future
This lesson covers the fundamentals of inheritance and genetics for Year 11 students. It focuses on the relationship between genes and characteristics, the use of Punnett squares for monohybrid crosses, and the inheritance of specific genetic disorders.
Learning objectives
- Define key genetic terms including chromosome, gene, allele, genotype, and phenotype.
- Explain the difference between dominant and recessive alleles.
- Use Punnett squares to predict the outcomes of monohybrid crosses, including probability and ratios.
- Interpret genetic diagrams to explain the inheritance of genetic disorders like polydactyly and cystic fibrosis.
Lesson plan (60 minutes)
Introduction · 5 min
Retrieval practice: DNA structure and cell division (mitosis vs meiosis) starter quiz.
Explicit Instruction · 15 min
Teacher-led explanation of key terms (Genotype, Phenotype, Allele) and Punnett square demonstration.
Guided Practice · 10 min
Guided practice: Students complete a 'simple cross' (e.g., eye colour) together with the teacher.
Independent Practice · 20 min
Independent practice: Differentiated worksheets (Support, Core, Stretch) focusing on monohybrid crosses.
Plenary/Assessment · 10 min
Plenary: 8-question multiple choice quiz to check for understanding.
Key vocabulary
- Allele
- Different versions of the same gene.
- Dominant
- An allele that is always expressed in the phenotype, even if only one copy is present.
- Recessive
- An allele that is only expressed if two copies are present.
- Homozygous
- Having two identical alleles for a particular gene (e.g. BB or bb).
- Heterozygous
- Having two different alleles for a particular gene (e.g. Bb).
Core worksheet (first questions)
- 1. Describe the structure of DNA.
- 2. If an organism has two different alleles for a trait (e.g. Tt), what is the scientific term for this?
- 3. A heterozygous brown-eyed man (Bb) has a child with a blue-eyed woman (bb). Use a Punnett square to predict the probability of a blue-eyed child.
- 4. Explain what 'genotype' means.
Quiz (sample)
1. What is a gene?
- A. A type of cell division
- B. A section of DNA that codes for a protein
- C. The physical appearance of an organism
- D. A structure made of pure protein
2. What are different versions of the same gene called?
- A. Gametes
- B. Genotypes
- C. Alleles
- D. Phenotypes
3. Which of these represents a homozygous recessive genotype?
- A. BB
- B. Bb
- C. bb
- D. bB
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