Biology 3484A/B Chapter Notes - Chapter 4a: Hermaphrodite, Animal, Zygote
29 May 2016
School
Department
Course
Professor
Document Summary
Scientists care who is related to who because phylogeny is the product of evolution. Want to know how animal diversity and animal body plans came to be. Looking at the evolutionary relationships between major groups of animals e. g. morphological characters. To understand animal phylogeny we can look at the molecules within animal cells. The phlogeny is a relatively conservative guess based on 18s ribosomal rna sequence data . many unresolved branches so much work to be done. Multicellularity has been independently developed in at least seventeen different groups of organisms including plants, fungi, etc. At the cellular level, animals begin to all look alike. But, animals also resemble many other groups of organisms at that level. Must look at extracellular matrix (ecm) composed of collagen, proteoglycans, adhesive glycoproteins, and integrin. These four types of molecules are created inside, but exist outside, the cells of animals. These molecules fill up the spaces between cells and serve as structural elements.
