Genes are the basic unit of inheritance by which characteristics are passed on from one generation to another



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Genes

  • Genes are the basic unit of inheritance by which characteristics are passed on from one generation to another.

  • DNA-Deoxyribonucleic acid, contains instructions in the form of 4 chemicals which act as code letters.

  • DNA forms double helix and has 4 bases- Adenine (A), guanine(G), cytosine(C), thymine(T). They form pairs, A and T; G and C.

  • Chromosomes – long strands of DNA. In each cell, the nucleus has 46 chromosomes, 23 from mother and 23 from father.




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