Test crosses Original Scenario-Based Download PDF

Questions

1. 1.

   An exobiologist cultivating rare subterranean dusk-lilies discovers that glowing violet petals are dominant to non-glowing translucent petals. To establish whether a glowing violet specimen is homozygous or heterozygous, she performs a test cross by mating it with a translucent individual. Which observation among the resulting offspring conclusively confirms that the violet dusk-lily was heterozygous?

   • A) Approximately equal numbers of violet and translucent offspring
   • B) Offspring displaying exclusively violet petals across all individuals
   • C) A phenotypic ratio of three violet offspring to one translucent offspring
   • D) Offspring displaying uniformly intermediate lavender petals