Tilapiais anexciting species model.Tilapiadisplay a social hierarchy with families composed of one dominant male,afew subordinate males,andeager-to-reproduce-with-the-dominant-guy females. We know a lot about howtilapia regulatereproduction, but very littleis known abouthow the endocrine systemregulatesmale dominance. These two articles summarize a fascinating study elucidatingthedominance mechanisms.Since you’refamiliar with most of the vocabulary,the articleswill bestraightforwardto understand. Theobjective istolinkthe article content withideas that advanceyourknowledge of endocrine control of pheromone communication in tilapia.
Provide as much detail as you can and remember toanswer the questions with full sentences, suitable for professional publication. Onquestion 9, explain how you did your calculations.Forquestion 10, be creative and thinkofsomethingthat would be performedin a laboratory.
1.Howcanunderstanding the endocrine regulation of social dominance in tilapia advance tilapia aquacultureand knowledge ofvertebrate reproduction?(10 point)
2.What are the hormones that show an up-regulation of gene expression and the hormones that increasethequantityinindividuals transitioning to dominance in both articles? (includeacronyms and full names).(10 point)
3.What are the receptorsspecifiedin both studies? Where are they expressed? What receptors are up-regulated after inducing dominance?(10 point)
4.What germinal cells are more abundant in dominant males?(10 point)
5.Explain with your own words how do theresearcherspromote social ascent in male tilapia.(10 point)
6.What methodisused to measure FSH and LH?(10 point)
7.What is the GSI and how is related with hormone production?(10 point)
8.How fast can the transition from submissive-male to dominant-male occur?(10 point)
9.Is the brain-pituitary-gonad system arrested in submissive males?(10 point)
10.Do subordinate males produce functional sperm?(10
point
)
11.Now we know a bit more about how the endocrine system regulates social transition. However, we know very little how pheromone release by dominant and subordinate males is regulated by the endocrine system. We know that dominant males pee pheromone 20b-pregnanetriol 3-glucuronates(20bPG) more frequently and more abundantly. Design a series of experiments that demonstrate the endocrine control of 20bPG. For thatexperiment,describe your hypothesis (what is the question, forinstance: I hypothesize the increaseinLH productionincreasesrelease of 20bP0G), yourprediction(s)(Iexpect to measuremore LH in dominant males), your methods (numberoffish, aquariums, etc.),and what you expect to learn from the experiment.(50
points
)
I have the two readings that go with it as well.