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Which type of genetic disease often skips
generation?
A dominant
B recessive
C sex-linked
a
Recessive genetic diseases often skip generations because two copies of the mutated gene are needed for the disease to be expressed. Individuals who carry only one copy may appear normal, allowing the disease to potentially skip generations. Examples include cystic fibrosis, where offspring inherit the disorder only if both parents are carriers.
Genetic diseases are typically classified into three categories: dominant, recessive, and sex-linked. The question at hand is regarding which type of genetic disease often skips generations. The answer is recessive genetic diseases.
Recessive genetic diseases require two copies of the mutated gene for an individual to manifest the disease. If a person carries only one copy of the mutated gene (is a carrier), they are phenotypically normal but can pass the gene to their offspring. This can result in a child inheriting the disease only if both parents contribute the recessive allele. Thus, the disease may not appear in every generation if carriers do not mate with other carriers.
For example, in the case of cystic fibrosis, a recessive disorder, a child can inherit the disease if both parents are carriers, even if neither parent shows symptoms. In contrast, dominant diseases, like Huntington's disease, tend to present in every generation because only one copy of the mutated gene is required for the disease to manifest.
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