A gene is a unit of heredity in a living organism.All living things depend on genes. All organisms have many genes corresponding to many different biological traits, some of which are immediately visible, such as eye color or number of limbs, and some of which are not, such as blood type or increased risk for specific diseases, or the thousands of basic biochemical processes that comprise life.
SO a gene can be defined as as a region of DNA that controls a hereditary characteristic.
A gene carries biological information in a form that must be copied and transmitted from each cell to all its progeny.
Genes are also defined as working subunits of DNA.Each gene contains a particular set of instructions, usually coding for a particular protein.
So finally gene can be defined as a hereditary unit consisting of a sequence of DNA that occupies a specific location on a chromosome and determines a particular characteristic in an organism.
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