Chromosomes Simplified Revision Notes for GCSE AQA Biology Combined Science

Revision notes with simplified explanations to understand Chromosomes quickly and effectively.

Learn about Cell Division for your GCSE Biology Combined Science Exam. This Revision Note includes a summary of Cell Division for easy recall in your Biology Combined Science exam

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1.2.1 Chromosomes info Note Genetic information is organized into structures called chromosomes, which are made up of long, tightly coiled strands of DNA . info Note Genes are short sections of DNA located on chromosomes. Each gene provides instructions for making a specific protein, which influences a particular characteristic or trait. Therefore, each chromosome carries many genes. In human body cells, there are 23 pairs of chromosomes —a total of 46 chromosomes . You inherit one chromosome of each pair from your mother and the other from your father. Sex cells (gametes), such as sperm and egg cells, are an exception. They contain only 23 chromosomes (one from each pair), ensuring that when they combine during fertilization, the resulting embryo has a full set of 46 chromosomes. info Note The nucleus is the control centre of the cell and contains your genetic information .

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