1) Autosomal dominant disease :-->
One mutated copy of the gene in each cell is sufficient for a person to be affected by an autosomal dominant disorder . In some cases , an affected person inherits for the condition from an affected parent . In others , the condition may result from a new mutation . In the gene and occur in people with no history of the disorder in their family.
E.g:--> Huntington disease , Marfan syndrome.
2) Autosomal recessive disease :-->
In autosomal recessive inheritance, both copies of the gene in each cell have mutations .The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene , but they typically do not show sign and symptoms of the conditions. Autosomal recessive disorders are typically not seen in every generation of an affected family.
E.g:--> Cystic fibrosis , Sickle cell disease.
3) X linked dominant disease :-->
X linked dominant disorders are caused by mutation in genes on the X chromosome one of the two sex chromosomes in each cell . In females (who have two X chromosomes) , a mutation in one of the two copies of gene in each cell is sufficient to cause the disorder. In male (who has only one X chromosomes) , a mutation in the only copy of the gene in each cell of disorder.
E.g:--> Fragile X syndrome.
4) X linked recessive diseases :-->
X linked recessive disorders are also caused by mutation in gene on the X chromosome . In male (who have only one X chromosome) , one altered copy of each gene in each cell is sufficient to cause condition . In female (who have only X chromosomes) , a mutation would have to occur in both copies of the gene to cause the disorder .
E.g:--> Hemophilia , Fabry disease.


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