Activities
Sex linked - model answers
This page shows suggestions of model answers for the activity: Students' structured notes worksheet - Sex linked genes on the HL Genetics topic, activities page Sex Linked Genes (2025) These are suggestions,...
eBook
D3.2 Inheritance - 5 Essential revision points
This is a '5 Essentials' revision (or review) sheet for Topic D3.2 Inheritance. It will help students remember the five most important details required for the topic. SL and HL concepts in the white...
eBook
A4.1 Evolution - 5 essential revision points
This is a '5 Essentials' revision (or review) sheet for Topic A4.1 Evolution & speciation. It will help students remember the five most important details required for the topic. SL and HL concepts in...
Activities
Double membranes HL (2025)
Adaptations of the mitochondrion for the production of ATP by aerobic cell respiration include its double membrane with a small volume of intermembrane space and compartmentalization in two places; in...
IB Core
Introduction to the extended essay
The extended essay can be daunting. It is longer than most other pieces of work in the IB program and the work is usually carried out by students on their own, over a long time span and with less direct...
Activities
Gene Linkage 1 (2025)
Discoveries in Biology can be a good source of learning about 'how science works'. The work of Sutton, Bateson, Sanders and Punnett to set the scene for gene linkage. Students make predictions of Mendelian...
Activities
Activity 2 - Dihybrid Qns - model answers
This page shows suggestions of model answers for the activities on the SL activities page Di-Hybrid Crosses. These are suggestions, not mark schemes, and many other wordings are also correct answers.Time...
ATL in Biology
Dihybrid questions model answers v2
This page shows suggestions of model answers for the activities on the SL activities page Di-Hybrid Crosses. These are suggestions, not mark schemes, and many other wordings are also correct answers.Time...
Activities
Di-Hybrid Crosses HL (2025)
This lesson gives a brief introduction to segregation and independent assortment of alleles, first mentioned in Mendel's laws of inheritance. There follows a guide to dihybrid genetic crosses using Punnett...
eBook
B2.1 Membrane & transport - reading task
This activity introduces the structure and function of the plasma membrane in cells. Not only does this cover the amphipathic nature of phospholipid structure, the bi-layer of phospholipids but also...