Pedigrees Original Scenario-Based Download PDF

Questions

1. 1.

   On the floating orbital sanctuary of Aethelgard, xenobiologists study a pedigree of starlight gliders displaying an iridescent feather trait linked to a specialized energy-producing organelle. In their records, every offspring born to an affected mother displays iridescent feathers regardless of the father's phenotype, whereas affected males paired with unaffected females never pass the trait to their young. When an affected female mates with a wild-type unaffected male, all five of their progeny—three females and two males—exhibit the full iridescent plumage. Which mode of non-Mendelian inheritance best explains the pedigree pattern observed in this lineage?

   • A) Autosomal dominant inheritance with high penetrance
   • B) X-linked recessive inheritance with paternal inactivation
   • C) Mitochondrial (maternal) extranuclear inheritance
   • D) Y-linked holandric inheritance transmitted across males