The occurrence of affected individuals in every generation in a family suggests which of these traits?
Correct answer: A. An autosomal dominant
- A. An autosomal dominant
- B. An autosomal recessive
- C. Either dominant or recessive
- D. Sex-linked
Explanation
Dominant mutations are expressed when only one copy of that mutation is present. Therefore, anyone who inherits one dominant disease mutation such as the mutation for Huntington's disease will have that disease. Dominantly inherited genetic diseases tend to occur in every generation of a family.
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About Inheritance
Mendel's laws explain segregation, independent assortment and the prediction of genetic ratios using alleles, genotypes and phenotypes. The chapter also covers linked genes, recombination and crossing over during meiosis, then applies pedigree reasoning to X-linked recessive traits, which show different inheritance patterns in males and females.
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