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Concept explainers
To review:
The role of symbiotic bacteria in reproductive isolation and in the origins of multicellular animals.
Introduction:
The
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Explanation of Solution
Explanation:
The adaptive potential confers by the microorganism depends upon a number of different mechanism. The relative abundance of microorganisms which are associated with the host shows an efficient change during environmental pressures shift. The adaptive variation has a tendency to introduce new symbionts. The genomic change caused by the recombination or random mutation incorporate more rapidly in microbial symbiont comapre to the host. Probably their is a horizontal gene transfer occurs between the members of symbiotic community. Symbionts can cause the reproductive isolation, in this isolation interbreeding is prevented between the holobiont populations. The presence of microorganism in a species specially in the cytoplasm of the cell and absence in another, can prevent the formation of a viable hybrid. Data suggests that symbionts may cause the genetic incompatibility, and acts as a reproductive barrier.
The evolution of multicellularity is also associated with the symbionts. The first evidence of multicellularity is from cyanobacteria-like organisms around 3-3.5 billion years ago. The cell organelles mitochondria and chloroplast also share a number of similarities with bacterial cells, indicate the origin of multicellular organism.
Thus it is concluded that symbiotic bacteria play an important role in reproductive isolation and also in the origins of multicellular animals as explained in the above section.
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Chapter 26 Solutions
Developmental Biology
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- Using information from the primary literature (several references have been provided as a starting point below) please answer the following question: Based on your review of the literature on rewilding, what are the major scientific pros and cons for rewilding? Please note that the focus of this assignment are the (biological) scientific issues associated with rewilding. As will be discussed in class, there are a number of non-scientific issues involved or implicated in rewilding, all ultimately affecting the public acceptability of rewilding. Although these issues are important – indeed, critical – in this assignment you should focus on the biological science issues and questions. Details: You must enumerate at least two pros and at least two cons. Your answer should be no more than 500 well-chosen words, excluding references. Think carefully about how best to organize and structure your answer. Aim for high information density: say a lot, but say it succinctly. Recall Nietzche’s…arrow_forwardNow draw a rough sketch of what the control data might look like if in addition to the specific binding, there was also a considerable amount of nonspecific binding (again using a normal dose/response curve) (do % total bound ligand vs concentration)arrow_forwardWhat are functions of cuboidal cells in the kidney? Select all that apply. Concentration of gases Dilution of chemicals Secretion of molecules Nutrition to tissues Support of tissues Absorption of moleculesarrow_forward
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