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What is a Gene? Like a word in a book, a gene is the basic unit of DNA instruction. Each gene has specific job to do. Some genes carry the instructions for noun. the basic physical unit of heredity; a linear sequence of nucleotides along a segment of DNA that provides the coded instructions for synthesis of RNA, which, when translated into protein, leads to the expression of hereditary character. 25 Sep 2017 Genes are specific sequences of bases that encode instructions on how to and formulated in what is known as Mendel's law of segregation. Genetics is a branch of biology concerned with the study of genes, genetic variation, and This term, still used today, is a somewhat ambiguous definition of what is referred to as a gene. .. possible amino acids in a protein or an instruction to end the amino acid sequence; this correspondence is called the genetic code.Find out how genes work, what happens when there are problems with it is, the nucleus has more information in it than the biggest dictionary you've ever seen. The DNA in a gene spells out specific instructions—much like in a cookbook Find information, videos, and activities about DNA, genes, chromosomes, the building blocks of inheritance. What is a Chromosome? Description: A genome is an organism's complete set of genetic instructions. . Learn about the molecular structure of these macromolecules and where examples of these molecules 6 Oct 2016 Genes are small sections of DNA within the genome that code for proteins. They contain the instructions for our individual characteristics – like eye and hair colour. Each gene contains the information required to build specific proteins needed in an organism. The human genome? contains 20,687 protein-coding genes. Deoxyribonucleic acid (DNA) is a nucleic acid that contains the genetic instructions for the development and function of living things. All known cellular life and Medical Definition of Genetic code. Genetic code: The instructions in a gene that tell the cell how to make a specific protein. A, T, G, and C are the 'letters' of the DNA code and represent the chemicals adenine, thymine, guanine, and cytosine, respectively. These make up the nucleotide bases of DNA. A gene is made of DNA (deoxyribonucleic acid) and is basically a type of genetic instruction. Those instructions can be used for making molecules and controlling the chemical reaction of life. Genes can What is a gene? A few definitions:.