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Pedigrees Original Scenario-Based Practice

Biology · Heredity · Biology · Non-Mendelian Genetics

1 Biology practice questions on Pedigrees. Questions built around original scenarios.

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Questions

  1. 1.

    In an expedition observing an isolated population of bioluminescent cave-dwellers, geneticists trace a rare cellular trait called frost-glow across four generations. Every child born to a mother displaying frost-glow inherits the trait without exception, whereas affected fathers paired with unaffected mothers yield exclusively unaffected children. Based on this pedigree pattern, which mode of non-Mendelian inheritance governs frost-glow, and what is the expected outcome among the offspring of an affected male and an unaffected female?

    • A) Mitochondrial inheritance; 0% of the offspring will exhibit frost-glow.
    • B) Autosomal dominant inheritance; 50% of the offspring will exhibit frost-glow.
    • C) X-linked dominant inheritance; 100% of daughters and 0% of sons will exhibit frost-glow.
    • D) Incomplete dominance; 100% of the offspring will exhibit an intermediate glow.

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