Retinitis pigmentosa is a disease that manifests itself via different genetic modes of inheritance. Cases have been documented with a dominant, recessive, and sex-linked mode of inheritance. It has...

Retinitis pigmentosa is a disease that manifests itself via
different genetic modes of inheritance. Cases have been
documented with a dominant, recessive, and sex-linked
mode of inheritance. It has been conjectured that mode of
inheritance is related to the ethnic origin of the individual.
Cases of the disease have been surveyed in an English
and a Swiss population with the following results: Of 125
English cases, 46 had sex-linked disease, 25 had recessive disease, and 54 had dominant disease. Of 110 Swiss
cases, 1 had sex-linked disease, 99 had recessive disease,
and 10 had dominant disease.

Do these data show a significant association between ethnic origin and genetic type?