Well you need to form your own answer I will help you by giving you points by which you can frame your own answer.
Gene is the functional and basic unit if heredity. Made up of DNA. Every organism are composed of many genes. Code for proteins but not all. Many genes are same in all humans but each of them have some genes different in them which makes one unique then others. Human Genome Project. 20000 to 25000 genes. Alleles. Genes determine the physical form of the organisms. They also determine the appearance and habits of the organism.
These points will helps you make a paragraph of more than 200 words easily.
Hope this helps, Good luck!!!!
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