The lesson starts with identifying and describing the terms ‘ecosystem’ and ‘niche’ and then how the different levels that biodiversity can be assessed at. The lesson concludes with an explanation of the importance of random sampling, suitable random sampling methods and use the Lincoln Index. Full worked examples included.

This lesson provides students with the opportunity to analyse the relationship two variables and how biotic and abiotic factors affect distribution and abundance of species. Fill worked examples of Pearson’s Linear Correlation included.

This lessons cover the explanation of the causes of phenotypic variation and the differences between discontinuous and continuation in terms of genetics. The lesson covers the T-Test to compare two difference samples of variation including worked examples.

This lesson covers the factors that can affect the size of populations and the causes of natural selection.

This lesson covers the environmental factors can act as stabilising, disruptive and directional forces of natural selection and how selection, the founder effect, genetic drift and the bottleneck effect may affect allele frequencies in populations.

This lesson covers how bacteria become resistant to antibiotics as an example of natural selection.

This lesson teaches the principle to calculate allele and genotype frequencies in populations.

This lesson covers the principles of selective breeding using examples: Disease resistance in rice and wheat; Strong maize; Increased milk yield in dairy cattle.

This lesson covers interpretion and constructing genetic diagrams to predict the results of dihybrid crosses that involve autosomal linkage. Some material has been adapted from other TES contributors and I have included additional material to support.

This resource covers everything concerning genetics and sex linkage, using genetic diagrams to predict and explain the results of monohybrid crosses.

This lesson covers interpretation and construction of genetic diagrams to explain and predict results of dihybrid crosses involving autosomal linkage and epistasis,

This resource builds on previous learning of dihybrid and monohybrid crosses to apply the Chi-square test and to use the Chi-square test to analyse the results of crosses (B-A).

Lesson covers the following diseases in terms of genes, the proteins they encode, and the phenotype expressed: Albinism; Sickle Cell Anaemia; Haemophilia; Huntingdon’s Disease. The lesson also cover the role of gibberellin in plants and effects of the two alleles that code for it’s functional enzyme.

This lesson covers the differences between structural and regulatory genes, and repressible and inducible enzymes. It progresses to cover genetic control protein production in prokaryotes using the lac operon , and the to describe and explain the use of transcription factors in plants.

This lesson recalls Darwin’s Theory of Evolution and discusses how DNA sequences can be used to show evolutionary relationships between species. The lesson then looks at how speciation occurs as a result of Allopatric speciation and Sympatric speciation.

This lesson provides students descriptions and explanations on the effects of temperature on enzyme action. Fully resourced with worked examples.

Fully resourced lesson which looks at pH as a factor of affecting reaction rates.

Fully resourced lesson to teach how differing concentrations of enzymes and/or substrates affect enzyme action.

This resource covers both competitive and non-competitive inhibition. Fully resourced with lots of exam practise.

This lesson covers the type of protein that enzymes are categorised into and teaches students how to describe and explain how enzymes work in terms of: the active site; the enzyme–substrate complex; lowering of activation energy, and enzyme specificity. The lesson then progresses into the differences between the lock-and-key hypothesis and the induced-fit hypothesis. Fully resources and exam questions.