Genotype is a term used in genetic engineering to refer to the genetic makeup of an organism which is separate from physical features and appearance. These are a combination of alleles on chromosomes and are responsible for determining characteristics and traits of an organism.
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A genotype is the genetic makeup or physical appearance of an organism. This can be the result of hereditary which can result in diseases and disorders. You can find more information here: http://en.wikipedia.org/wiki/Genotype