A disease with a 50% transmission rate to offspring of either gender is likely what type of inheritance?

Prepare for USMLE Step 1 Pathology Exam with comprehensive quizzes, flashcards, and detailed explanations. Enhance your understanding and be exam-ready!

Multiple Choice

A disease with a 50% transmission rate to offspring of either gender is likely what type of inheritance?

A disease with a 50% transmission rate to offspring of either gender is characteristic of autosomal dominant inheritance. In autosomal dominant disorders, a single copy of the mutated gene inherited from an affected parent is sufficient to cause the disorder. Therefore, each child of an affected individual has a 50% chance of inheriting the mutant allele, regardless of their sex. In contrast, X-linked recessive disorders typically affect males more frequently than females since males have only one X chromosome. Hence, affected fathers cannot pass these conditions to their sons, and a carrier mother would have a 25% chance of passing the disorder to each child (50% to sons, 0% to daughters). Autosomal recessive conditions require two copies of the mutant allele for the disease to manifest, leading to a lower probability of transmission since both parents must be carriers for the offspring to inherit the disorder. X-linked dominant disorders would also not confer a 50% chance of transmission to sons if the affected individual is male, further confirming that the disease in question is more consistent with autosomal dominant inheritance.

A disease with a 50% transmission rate to offspring of either gender is characteristic of autosomal dominant inheritance. In autosomal dominant disorders, a single copy of the mutated gene inherited from an affected parent is sufficient to cause the disorder. Therefore, each child of an affected individual has a 50% chance of inheriting the mutant allele, regardless of their sex.

In contrast, X-linked recessive disorders typically affect males more frequently than females since males have only one X chromosome. Hence, affected fathers cannot pass these conditions to their sons, and a carrier mother would have a 25% chance of passing the disorder to each child (50% to sons, 0% to daughters). Autosomal recessive conditions require two copies of the mutant allele for the disease to manifest, leading to a lower probability of transmission since both parents must be carriers for the offspring to inherit the disorder. X-linked dominant disorders would also not confer a 50% chance of transmission to sons if the affected individual is male, further confirming that the disease in question is more consistent with autosomal dominant inheritance.

More practice questions