Which of the Following Is an Example of Colinearity

Multiple Choice

Which of the following is an example of colinearity?

A) Replacement of a normal allele by a mutated transgene
B) Migration of cells during embryogenesis to form three primary germ layers
C) A process in which cells are assigned developmental fates
D) The physical order of genes corresponding to their expression along the anterior-posterior axis
E) Genetic dissection of a developmental pathway by analyzing gene mutations