In a certain plant species, thick-shelled seeds are caused by the dominant allele T. Thin-shelled seeds are caused by the recessive allele t. What is the genotype of an individual with thin-shelled seeds?
A) TT
B) tt
C) Tt
D) tt or Tt

Question

Quizplus · Accepted Answer

An individual with thin-shelled seeds must have two copies of the recessive allele, so their genotype can only be tt. The other options (TT and Tt) would result in thick-shelled seeds. The answer could also be written as D (tt or Tt), but B is the most specific and accurate answer.

In a Certain Plant Species, Thick-Shelled Seeds Are Caused by the Dominant