Describe a DNA molecule as two strands coiled to form a double helix, the strands being linked by a series of paired bases: adenine (A) with thymine (T), and cytosine (C ) with guanine (G)
Chromosomes are likely to contain thousands of genes
Position on it a gene loci
Expanding a gene loci -> double helix
Double helix
Parallel
Expanding small section holding double helix together -> Helixes
Helixes are called sugar-phosphate backbone
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| Source: http://ghr.nlm.nih.gov/handbook/illustrations/dnastructure.jpg |
Centre - group of molecules called bases
(4 types of base - adenine, thymine, cytosine, guanine)
Base pairs: A-T and G-C
Example of gene - ACTGAACCAG
Order of the bases -> The order is a gene
Nucleus - Order of bases (ACTG)
- Number of bases
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| Source: http://www.youtube.com/watch?v=CEBmnfLWDQs |
Gene (nucleus) -> Protein (cytoplasm) -> Characteristic
A gene is the order of the bases on one side of the helix
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