Question: Cases of retinitis pigmentosa have been studied in two distinct populations: Swiss [110 individuals] and English [125 individuals]. The genetic disease may be inherited in one of three ways: sex-linked, recessive, and dominant. The survey found:

English Swiss

Sex linked cases 46 1
Recessive cases 25 99
Dominant cases 54 10

125 110

Do these data show a significant association between ethnic origin and genetic type? [use alpha of 1%] Do not forget to specify the null and alternative hypotheses.

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