Edexcel OLevel Biology revision notes

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Lesson

Lesson-3.2.1- understand that the genome is the entire DNA of an organism and that a gene is a section of a molecule of DNA that codes for a specific protein.

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Lesson-3.1.13- understand the roles of oestrogen and testosterone in the development of secondary sexual characteristics.Previous Lesson-3.2.2-understand that the nucleus of a cell contains chromosomes on which genes are located.Next