This preview shows page 1. Sign up to view the full content.
Unformatted text preview: indication of the amount of plasticity "tolerated" in the organism in question. A highly canalized organism (or developmental program) would have low plasticity . Another variant form of the plasticity issue is that some organisms may exhibit threshold effects where there is not a clear gradual transition between forms, but a stepwise change of phenotype in response to a gradual environmental change. See fig. 9.11, pg. 242, but note that these graphs do not have an environmental axis, so a distinct from a norm of reaction. One example of this are plants that have distinctly different growth forms in different environments. Question: is there an "environment" that is half way in between air and water?, and if so would these plants exhibit a graded response to such an environmental gradient?...
View Full Document
- Fall '10