Final answer:
The strategies of controlling developmental gene expression that establish asymmetry involve the sequential expression of Hox genes and genetic programming of certain cells. Mutations in the genes responsible for axis formation can disrupt symmetry in organism development.
Step-by-step explanation:
The strategies of controlling developmental gene expression that establish asymmetry involve the regulation of gene activity during development.
One strategy is the sequential expression of Hox genes, which control the development of the body plan in both fruit flies and vertebrates.
The arrangement of Hox genes in the genome maps out the anterior to posterior body plan.
Another strategy is the genetic programming of certain cells to form specific structures, as demonstrated by the transplantation experiment by Spemann and Mangold.
Mutations in the genes responsible for axis formation can lead to the loss of symmetry required for organism development.