Cnidarians are diploblasts and lack mesoderm. Describe how you could use this characteristic to investigate the evolutionary origins of mesoderm in other animals.
Mesoderm played a crucial role in the radiation of the triploblastic Bilateria, permitting the evolution of larger and more complex body plans than in the diploblastic, non-bilaterian animals. The sea anemone Nematostellais a non-bilaterian animal, a member of the phylum Cnidaria. The phylum Cnidaria (sea anemones, corals, hydras and jellyfish) is the likely sister group of the triploblastic Bilateria. Cnidarians are generally regarded as diploblastic animals, possessing endoderm and ectoderm, but lacking mesoderm. To investigate the origin of triploblasty, we studied the developmental expression of seven genes from Nematostella whose bilaterian homologs are implicated in mesodermal specification and the differentiation of mesodermal cell types (twist, snailA, snailB, forkhead, mef2, a GATAtranscription factor and a LIM transcription factor). Except for mef2, the expression of these genes is largely restricted to the endodermal layer, the gastrodermis. mef2 is restricted to the ectoderm. The temporal and spatial expression of these `mesoderm' genes suggests that they may play a role in germ layer specification. Furthermore, the predominantly endodermal expression of these genes reinforces the hypothesis that the mesoderm and endoderm of triploblastic animals could be derived from the endoderm of a diploblastic ancestor. Alternatively, we consider the possibility that the diploblastic condition of cnidarians is a secondary simplification, derived from an ancestral condition of triploblasty.
Cnidarians are diploblasts and lack mesoderm. Describe how you could use this characteristic to investigate the...
Cnidarians are diploblasts and lack mesoderm. Describe how you could use this characteristic to investigate the evolutionary origins of mesoderm in other animals.
24. Describe how you could use Euler's method to approximate x > exp()? 24. Describe how you could use Euler's method to approximate x > exp()?
describe an adverse event where communication (or lack of communication) was or could be a contributing factor. Discuss the best way to address the communication issues and how best to track this type of event for improvement purposes. Think of your own professional experience within healthcare or in any organization. What have you seen that has helped or hurt communication?
Describe a workflow issue you have encountered in practice and explain how you could use a gap analysis to plan for change.
Describe how you do or could use operations security in your current job If you are currently unemployed, define the job you are looking to apply for and how you would use operation security in that job position 500-700 words
I work at a post office and i need to Describe how you could use hypothesis testing to help make a decision in your current job, a past job, or a life situation. Include a description of the decision, what would be the null and alternative hypotheses, and how data could ideally be collected to test the hypotheses. Describe how you could use confidence intervals to help make a decision in your current job, a past job, or life situation....
QUESTION 1 The “Cambrian Explosion” describes the relatively sudden appearance of __________ in the fossil record in the Cambrian. Metazoans Eukaryotes Algae Cephalopods Chocolate 0.5 points QUESTION 2 Poriferans lack: Extracellular matrix Organs Choanocytes Nuclei 0.5 points QUESTION 3 Which of the following has no terrestrial species? Brachiopoda Nematoda Mollusca Arthropoda 0.5 points QUESTION 4 The metazoan phylum with the greatest diversity (i.e., number of species) today is: Arthropoda. Annelida. Cnidaria. Mollusca. 0.5 points QUESTION 5...
To investigate Archimedes' principle with household objects. Describe how you find the density of a cantaloupe. Conduct the actual experiment at home and write your result down, Put the object in a large container filled with water. Describe how you find the buoyant force on the object. Conduct the actual experiment at home and write your result down.
Choose an animal which represents a particular phylum. Briefly describe its features characteristic of its phylum including morphology, embryology, and physiology. Identify adaptations of your animal compared with other animals. If you chose a more primitive animal, identify adaptations compared with more primitive organisms outside of the animal kingdom.
Describe how you could use hypothesis testing to help make a decision in getting your son to sleep by 9 pm please help