What should the nurse include when counseling potential parents about genetic disorders?
A) Environmental influences may affect multifactorial inheritance.
B) Genetic disorders primarily follow Mendelian laws of inheritance.
C) All genetic disorders involve a similar number of abnormal chromosomes.
D) The absence of genetic disorders in both families eliminates the possibility of having a child with a genetic disorder.
A
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Not all genetic disorders follow Mendelian laws of inheritance. Diseases caused by multiple factors do not follow Mendelian laws because more than a single gene or HLA is involved. Environmental influences may be instrumental in determining whether the disorder is expressed. All genetic disorders do not involve a similar number of abnormal chromosomes. A family history may reveal no set pattern so an absence of genetic disorders in both families does not necessarily eliminate the possibility of having a child with a genetic disorder.
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