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Monday, November 2, 2009

how does Genome DNA determine our physical characteristics?

DNA is a long molecule, like a chain, where the links of the chain are pieces called nucleotides. There are four different types of nucleotides in DNA which we'll call 'A', 'G', 'C' and 'T'. These four Justify Fullare all that's necessary to write a code that describes our entire body plan. Sounds too simple?DNA chains are made by connecting those nucleotides together via chemical bonds. At right is a diagram showing four nucleotides connected to form an oligonucleotide.

Full genome dna sequencing, also known as whole genome dna sequencing, complete genome sequencing, or entire genome sequencing, is a laboratory process that determines the complete DNA sequence of an organism's genome at a single time. This entails dna sequencing all of an organism's chromosomal DNA as well as DNA contained in the mitochondria or chloroplast, depending respectively on whether the organism is an animal.

DNA stands for deoxyribonucleic acid while RNA stands for ribonucleic acid. RNA is very similar to DNA but differs in a few important structural details RNA is usually single stranded while DNA is usually double stranded. RNA nucleotides contain ribose while DNA contains deoxyribose a type of ribose that lacks one oxygen atom and RNA uses the nucleotide uracil in its composition instead of thymine which is present in DNA.

Shotgun sequencing is a method for determining the sequence fo a very large piece of DNA. The basic DNA sequencing reaction can only get the sequence of a few hundred nucleotides. For larger ones, we usually fragment the DNA and insert the resultant pieces into a convenient vector replicate them. After we sequence the fragments, we try to deduce from them the dna sequence of the original DNA.

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