Biological Science 6th Edition by Scott Freeman,Kim Quillin,Lizabeth Allison,Michael Black,Greg Podgorski,Emily Taylor,Jeff Carmichael

Exercise 2

Why is the allele for wrinkled seed shape in garden peas considered recessive?
A) It "recedes" in the F2 generation when homozygous parents are crossed.
B) The trait associated with the allele is not expressed in heterozygotes.
C) Individuals with the allele have lower fitness than that of individuals with the dominant allele.
D) The allele is less common than the dominant allele. (The wrinkled allele is a rare mutant.)