This lesson covers how hydrogen bonding occurs between water molecules and relates the properties of water to its roles in living organisms which are limited to solvent action, high specific heat capacity and latent heat of vaporisation. Additional reources include AS level exam questions and mark scheme, and the Biofactsheet on the topic.

This lesson provides guidance for AS students to complete all food testing including extra help with the non-reducing sugar test. Consolidation exam questions are also included.

This lesson identifies and describes the functions of the reproductive organs of insect and wind pollinated flowers. Students then identify differences between wind and insect pollinated flowers and distinguishes between two different types of pollen grain and describes the process of pollination. The lesson then progresses to look at the differences between cross pollination and self-pollination. Fully resourced.

This is a fully resourced lesson on the process of meiosis with opportunity for students to model all phases in meiosis I and II. Exam practise included in the PPT and also the hard, medium and easy questions from Save My Exams.

This lesson starts with a recall of the differences between cross pollination and self-pollination and then the process of fertilisation. The lesson then covers the effects of cross and self-pollination. Fully resourced.

This lesson covers the conditions needed for seed growth and provides the opportunity for an investigation into these conditions. Exam questions for the whole plant topic included.

In this lesson students recall the process of mitosis and learn how it works. Students then learn how meiosis results in the formation of haploid cells. The lesson then progresses to explain how mitosis and meiosis are used in the formation of an embryo. Fully resourced. Exam questions included.

This lesson starts with a recall of the structure of phloem tubes and their companion cells. Students then learn of the process of translocation from source to sink. Finally, the lesson covers why some parts of the plant may be a source and sink at different times of the year. Fully resourced, exam questions included.

In this lesson, students learn about transpiration in terms of water potential how water moves from the soil through a plant and into the air. They learn of the three pathways by which water is transported from soil to xylem and the three mechanisms by which water is moved from roots to leaves. Exam questions included.

in this lesson the students learn about what happens to the zygote after fertilisation. They then learn about the role of the placenta, umbilical cord, amniotic sac and fluid, and how nutrients and waste products are exchanged between mother and fetus (B). Fully resourced with exam questions.

In this lesson, students identify the reproductive organs and describe their roles in fertilisation. They then progress to describe and explain the features of the gametes, finishing with outlining stages of fertilisation and the formation of a zygote. Videos and exam questions included.

In this lesson students learn what an STI is with reference to what HIV is and describe how HIV can lead to AIDS. Students learn how HIV is transmitted and how transmission of STI’s can be controlled (B). Fully resourced with exam questions.

This lesson starts with the different types of proteins that DNA codes for and how chromosomes are used to make proteins - transcription and translation. The lesson concludes with why not all genes are expressed at the same time. Fully resourced with videos and exam questions.

In this lesson, students learn about the role of chromosomes and the relationship between chromosomes, genes and DNA. They then learn of differences between genes and alleles. Differences between the X and Y chromosomes are learnt and how gender is inherited. Lesson concludes with a brief overview how genes code for proteins. (Transcription and Translation comes in another lesson). Fully resourced with videos and exam questions.

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.