The ability to roll the edges of the tongue upward in a U-shape is inherited as a dominant allele at a single gene locus. Which of the following genotypes would produce an individual that can roll their tongue?
A) TT only
B) Tt only
C) tt only
D) TT or Tt
E) Tt or tt

Question

Quizplus · Accepted Answer

The ability to roll the tongue is inherited as a dominant trait, therefore, an individual must have at least one dominant T allele to be able to roll their tongue. As TT and Tt genotypes both include at least one dominant T allele, individuals with either of these genotypes will be able to roll their tongue.

The Ability to Roll the Edges of the Tongue Upward