Most genetic diseases are autosomal recessive for this reason. Tay-Sachs Disease and Cystic Fibrosis are 2 common autosomal recessive diseases. Chromosomal Error Diseases Chromosomal error diseases occur when spontaneous mutations occur in the chromosomes during meiosis. These errors often prove fatal. In some cases genetic diseases result as a direct result of these errors.
Nondisjunction is a common type of error .
To the left are illustrations of 2 other types of chromosome errors. On the top is a condition called Insertion. Sex linked genes are genes that are carried on either the X or Y chromosome. Because of this sex-linked diseases follow different patterns of inheritance depending on the sex of a child. Colorblindness and hemophilia are both recessive genes linked to the X chromosome.