Multiple alleles Original Scenario-Based Download PDF

Questions

1. 1.

   In a hidden valley, the petal coloration of crystalline orchids is controlled by a single autosomal gene with four alleles exhibiting complete dominance in the order $R^1$ (ruby) > $R^2$ (sapphire) > $R^3$ (amber) > $r$ (clear). A botanist crosses a ruby-petaled orchid with an amber-petaled orchid, and several offspring in the first generation produce clear petals. Based on this inheritance pattern, which phenotypic distribution is expected among the offspring of this cross?

   • A) 25% ruby, 25% sapphire, 25% amber, and 25% clear
   • B) 75% ruby and 25% clear
   • C) 50% ruby, 25% amber, and 25% clear
   • D) 50% ruby and 50% amber