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gene is the basic physical and functional unit of heredity. Genes, which are made up of DNA, act as instructions to make molecules called proteins. In humans, genes vary in size from a few hundred DNA bases to more than 2 million bases

Probably the only answer you'll have to remember for GCSE...

"A gene is a section of DNA which codes for a specific protein"

gene is the basic physical and functional unit of heredity. Genes, which are made up of DNA, act as instructions to make molecules called proteins. In humans, genes vary in size from a few hundred DNA bases to more than 2 million bases

A gene is a short section of DNA. Each gene codes for a specific protein by specifying the order in which amino acids must be joined together

Just to add to what has been said already..

Cells contain DNA which is split up into sections called genes. In different cells a different combination of genes are switched on or off depending on the proteins they need and the function of the cell. If a gene is switched on it will be made into a protein by transcription and translation.

An allele is a version of a gene- ie if you had a gene for eye colour, one allele may be brown and another blue.

A gene is a short section of DNA that codes for a protein. Genes are found within the chromosomes. A chromosome is a long coiled molecule of DNA, they look like the X shaped structures you see in diagrams (they are just made from lots of DNA coiled together and a short chunk of this DNA which makes a protein is called a gene).

There are various definitions of what a "gene" is, but a nice simple and inclusive one is that a gene is a sequence of DNA that encodes a functional product; it was once thought that all genes encoded proteins, but is now recognised that many genes code for functional RNA molecules (ribonucleic acid), which play various roles in the cell such as protein synthesis and regulating the expression of genes.

Humans have around 25,000 protein-coding genes, which serve as instructions for making all the proteins a cell needs: enzymes, transport proteins, structural proteins, pigments, and so on. There are genes which influence observable characteristics which vary between individuals, such as eye colour. Genes are inherited from parent to offspring; in sexually reproducing organisms, this happens by the processes of meiosis (production of sperm and eggs) and fertilisation. The study of the inheritance of genes is genetics.

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