Before you aim to tackle Inheritance at A-level you firstly need to understand the key principles learnt during GCSE. The PowerPoint below is brief outline of the main points, understanding these initial ideas will allow for a better understanding later.
The video above explains the basics of using punnet squares, rememebr you also need to be able to interpret genetic cross diagrams. The video does also go into further detail about sex linked genes etc. however we will be covering this