DNA is a chain built up of four simple building blocks. The four types are adenine, cytosine, thymine and guanine or A, C, T and G for short. The shapes of A and T and of C and G are "complementary". Each of the two pairs fit together neatly like pieces of a jigsaw puzzle. The two chains of the DNA structure stick together due to bonds which form between the complementary pairs of bases. It is the complementary base pairs that allow DNA to copy itself.
Under certain circumstances the two chains of the DNA molecule separate. New DNA bases come in and stick to their complementary partner on the existing chain. The new bases are then stuck together to make a "daughter" DNA chain. This process occurs for each of the original chains of the parent DNA molecule. Two daughter DNA chains are, therefore, formed.
Under certain circumstances the two chains of the DNA molecule separate. New DNA bases come in and stick to their complementary partner on the existing chain. The new bases are then stuck together to make a "daughter" DNA chain. This process occurs for each of the original chains of the parent DNA molecule. Two daughter DNA chains are, therefore, formed.
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