Epistasis Original Scenario-Based Download PDF

Questions

1. 1.

   In the luminous abyssal jellyfish Aurelia nox, glowing depends on two independently assorting genes: the recessive condition cc at the precursor locus completely blocks light production resulting in a dark phenotype, while dominant allele C allows luciferin production. At a second locus, dominant allele G modifies luciferin to emit an emerald glow, whereas homozygous recessive gg emits a sapphire glow. If two dihybrid jellyfish with the genotype CcGg reproduce, which phenotypic ratio is expected among their offspring due to this gene interaction?

   • A) 9 emerald : 3 sapphire : 4 dark
   • B) 12 emerald : 3 sapphire : 1 dark
   • C) 9 emerald : 6 sapphire : 1 dark
   • D) 9 emerald : 3 sapphire : 3 dark : 1 transparent