The client exhibits a trait that has appeared in every generation of his or her family. This is an example of which type of inheritance?
a. Autosomal recessive
b. Sex-linked recessive
c. Autosomal dominant
d. Sex-linked dominant
C
Autosomal dominant (AD) single-gene traits require that the gene alleles controlling the trait be located on an autosomal chromosome. A dominant gene allele is expressed even when only one allele of the pair is dominant. Other criteria for AD patterns of inheritance include that the trait appears in every generation with no skipping. Autosomal recessive, sex-linked recessive, and sex-linked dominant types of inheritance do not require that the trait appear in every generation of a family. Rather, in the case of sex-linked traits, the gender of family members determines whether a trait will appear in a family.
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