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Inheritance Revision

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Revision on the topic of inheritance for biology iGCSE

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Inheritance

,Chromosomes, Genes and DNA

 The nucleus contains your genetic material in the form of
chromosomes
 A gene is a section of DNA and it codes for a protein
 Chromosomes are long lengths of DNA coiled up

, Structure of DNA

 DNA is a double helix
 This means there are 2 backbones that spiral around each other
 The “rungs” between the 2 backbones are called bases
 The 4 bases are called Adenine, Thymine, Cytosine and Guanine
 Guanine pairs with Cytosine
 Adenine pairs with Thymine
 These matching pairs are called complementary bases
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