A gene is the basic structural and functional unit of life. A gene is the part of chromosome and responsible for some character or trait fo an organisms. Gene is made of DNA it is double stranded there are two stranded of DNA which is complementary (A one strand faces T is the other and G in one faces C in the other) and run anti-parallel to each other (the 3' OH of ribose present in one strand and 5' p residue of the other strand are located at the same and of a double helix) DNA replication is highly faithful, is semi conservative and is catalyzed by DNA polymerase.
Genes produce their phenotypic effects by specifying the aminoacid sequences of specific proteins. The nucleotide sequence of one stand of a DNA double helix is used by RNA polymerase as template to generate its complementary copy of RNA this RNA ultimately functions as messenger RNA and the process of its production is called transcription.
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