Campbell Biology 11th Edition by Lisa Urry,Michael Cain,Steven Wasserman,Peter Minorsky,Jane Reece

Exercise 17

Absence of bicoid mRNA from a Drosophila egg leads to the absence of anterior larval body parts and mirror-image duplication of posterior parts. This is evidence that the product of the bicoid gene
A) normally leads to formation of head structures.
B) normally leads to formation of tail structures.
C) is transcribed in the early embryo.
D) is a protein present in all head structures.