Science · Year 10

Lesson 1

Describe DNA's double helix and base-pairing rules, and trace how Franklin, Watson and Crick's work revealed its structure.

⏱ 19 min · 9 questions

Lesson 2

Explain how DNA, genes and chromosomes are related and order the structures that package genetic information by size.

⏱ 17 min · 8 questions

Lesson 3

Explain how the base sequence of a gene is transcribed and translated into a protein that produces a trait.

⏱ 19 min · 8 questions

Lesson 4

Explain how mitosis produces genetically identical cells for growth and repair and sequence the stages of the cell cycle.

⏱ 18 min · 9 questions

Lesson 5

Explain how meiosis produces genetically varied gametes with half the chromosome number and compare it with mitosis.

⏱ 19 min · 9 questions

Lesson 6

Use the terms allele, dominant, recessive, homozygous and heterozygous to link genotype to phenotype.

⏱ 17 min · 8 questions

Lesson 7

Use Punnett squares to predict the ratios and probabilities of offspring genotypes and phenotypes.

⏱ 20 min · 9 questions

Lesson 8

Interpret pedigree charts to work out whether a trait is dominant or recessive and deduce family members' genotypes.

⏱ 20 min · 8 questions

Lesson 9

Explain how X and Y chromosomes determine biological sex and predict the inheritance of X-linked traits such as colour blindness.

⏱ 20 min · 8 questions

Lesson 10

Explain what mutations are, what causes them and why they can be harmful, neutral or beneficial.

⏱ 19 min · 9 questions

Lesson 11

Explore genetic testing, gene therapy and genetic modification, and weigh their benefits against the ethical issues they raise.

⏱ 20 min · 8 questions

Lesson 12

Compare observed with expected ratios and explain why larger samples give results closer to predictions.

⏱ 19 min · 9 questions