Aiden reviewed replication, transcription, translation and mutations. He read the text "A Closer Look: Why so blue?" which explained how blue eyes are the result of a genetic mutation. He read about genetic disorders and viewed diagrams of chromosomes with the defective gene. He completed the Investigation "Mutation Classification" where he labeled mutations positive, negative and neutral. He read the text "When Asthma Attacks" which discussed how asthma is genetically and environmentally caused.