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Basic physical and functional unit of heredity
In biology, the word gene ( ; generation, or birth, or gender) has two meanings. The Mendelian gene is a basic unit of heredity. The molecular gene is a sequence of nucleotides in DNA, that is transcribed to produce a functional RNA. There are two types of molecular genes: protein-coding genes and non-coding genes. During gene expression, DNA is first copied into RNA. RNA can be directly functiona... Wikipedia