Why do scientists think that insects are constrained to be relatively small? What evidence was used to test this hypothesis?
How are tetrapod limbs and fish fins developmentally similar?
A) Both start out as buds bulging from body wall.
B) Hox genes are used to produce both phenotypes.
C) Both grow from ectodermal tissue when Hox gene expression ceases.
D) a and b
E) b and c
Compare and contrast the formation of the gut in vertebrates and invertebrates.
Please describe at least two different ways that a patterning network can be perturbed to create an altered phenotype.