A polygenic trait is a trait which multiple genes affect. An example would be skin color, the combined affects of several genes determine your base pigment shade. Polygenic traits are caused by a combination of genes.
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Height is an example of a trait influenced by polygenic inheritance, where multiple genes contribute to determining an individual's height. Disorders such as Heart disease and Diabetes can also have a polygenic component, where several genes interact with environmental factors to increase susceptibility to these conditions.
Gaucher disease has a recessive pattern of inheritance, meaning that a person must inherit a copy of the defective gene from both parents in order to have the disease.
Huntington disease
Deletion Syndrome or Williams Syndrome
It is a genetic disease. Hemophilia is a genetic blood disorder. The person with this disorder has blood that doesn't clot as it should. It is not caused by a bacteria, virus or a protist.
The medical term for a condition caused by defective genes is genetic disorder. These disorders are caused by abnormalities in an individual’s DNA and can result in a wide range of symptoms and health issues.