1. Chromosomes are likely to contain thousands of genes > When you expand a chromosome, you will see a double helix, which appears to be parallel.
2. Holding the 2 strands of the helix is the sugar phosphate backbone > In the center, we find a group of molecules called bases > Adenine > Thymine > Cytosine and Guanine.
3. In the molecule, the bases hold together the two helixes > held together by Adenine and Thymine , and Guanine and Cytosine > these are known as base pairs > the base pairs glue one side of the DNA to the other
4. The gene has the order of bases and the number of bases > this codes for the construction of a protein in the cytoplasm > this gives the characteristic
A gene is the order of the bases on one side of the double Helix
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