The Importance Of Genetic Diversity - 749 Words

Intraspecific phenotypic variation exists for adaptive traits across a climatic gradient in natural populations. Latitudinal variations have been observed for seed dormancy, cold tolerance, height, and flowering time in Arabidopsis (Kronholm et al. 2012; Samis et al. 2012; Debieu et al. 2013). Likewise, in cultivated crop species, geographical distribution from tropical to cold temperate conditions became possible through adaptation of flowering time to local conditions (Camus-Kulandaivelu et al. 2006; Ducrocq et al. 2008; Buckler et al. 2009). Furthermore, local adaptation of traditional varieties has played essential roles in ensuring marginal yield under adverse climatic conditions in smallholder farmers’ fields and low input†¦show more content†¦2011). Furthermore, population genomic tools have helped improve our understanding of phenotypic evolution in crop species like maize (Ducrocq et al. 2008; Hufford et al. 2012; van Heerwaarden et al. 2012), rice (Olsen et al. 2006), and sorghum (Morris et al. 2013; Lasky et al. 2015; Zhang et al. 2015). Sorghum bicolor is an essential staple cereal crop in dryland regions of the world and it has adapted to a wide range of climatic environments with intraspecific phenotypic variation across clines for flowering time, plant architecture and inflorescence architecture (Thurber et al. 2013; Morris et al. 2013; Lasky et al. 2015; Zhang et al. 2015). For instance, in the West African region, climatic gradient occurs from mangrove swamplands and humid tropical rain forest in the coastal regions of Atlantic ocean in the south to arid environments up north at the edge of the Sahara desert. Sorghum phenotypic variation varies along this climatic gradient. Open panicle sorghum types are predominant in the humid regions while semi-compact to compact panicle types are predominant in the semi-arid and arid regions. The diversity of climatic zones often vary from country to country in the region. The Nigerian geographical landscape is divided into about 8 agroclimatic zones based on precipitation pattern. Sorghum is a major cereal in the northern regions of Nigeria, whichShow MoreRelatedThe Effects Of Germplasm On Plants And Tissue That Helps Maintain The Breeding And Conservation Essay1213 Words   |  5 Pagesagricultural production. The importance of germplasms is to produce plants for food, fibers, animal feeds, industrial and medicinal purposes, and for landscape and ornamental uses (4). With the increasing knowledge, many farmers are learning how to plant breeders, increase crop yields, and enhance quality. Plants carry DNA, which is primary genetic information that is carried in plants to make a duplication of the same crop. Germplasm is important for the living genetic resources of seed and tissueRead MoreWhat Are Genetic Diversity?995 Words   |  4 Pagestwo more different genes is not surprising. Genetic diversity can improve the lifespan of a population and individuals and protect the body from foreign substances. What is genetic diversity? Genetic diversity is the different level of genes in an individual. Genetic diversity, in a population, is the population contains most of one or more alternative forms of a gene that mutate at the same place on the chromosome (Paritsis). Furthermore, genetic diversity helps the population to adapt to the environmentRead MoreDiscuss the Issues Related to Genetic Diversity: Mutations, Sexual Reproduction, Migration, and Population Size.1087 Words   |  5 PagesDiscuss the issues related to genetic diversity: mutations, sexual reproduction, migration, and population size. --- Generally speaking, there are numerous issues related to genetic diversity which include mutations, sexual reproduction, migration, and population size. To begin with, mutations (any change in the DNA sequence of an organism) introduce new genetic information into a population by altering alleles (a form of a gene usually arising through mutation) that are already present. OccasionallyRead MoreThe Many Types Of Curcuma836 Words   |  4 Pageson studies of DNA variations to assess genetic relationships or diversity among varieties can accelerate ornamental plant breeding programs. Molecular markers have become useful for breeding and cultivar development in many crops (Syamkumar and Sasikumar, 2007). Among the molecular markers available, microsatellites or simple sequence repeats (SSR), which are tandem repeats of 1-6 nucleotide long DNA motifs, have gained considerable importance in plant genetics and breeding because of their multi-allelicRead MoreBiodiversity. Biodiversity Is The Variability Among Living1684 Words   |  7 Pagesother aquatic ecosystems. This includes diversity within species, between species, and ecosystems. The three main aspects of biodiversity include genetic diversity, species diversity, and ecosystem diversity. Biodiversity levels can change over time due to long-term natural processes including habitat loss. The importance of biodiversity is vital to all life on earth, determining extinction, evolution, and the fate of our planet’s ecosystems. Genetic diversity is the key ingredient from which all otherRead MoreGenetically Vigorous Populations Essay1508 Words   |  7 Pages Introduction into Genetic Diversity Genetic diversity provides a species with its form and function. A species genotype refers to their genetic code; what their cells are going to be used for – hair cell, eye cell, muscle cell, etc. A species phonotype refers to the way in which that species gene will be expressed – blonde hair, blue eyes, large muscle tone; which significantly impacts the success of that individuals genes. Without genetic diversity among populations the gene poolsRead MoreThe Production of Sesame in Ethiopia Essay examples1457 Words   |  6 Pagesrecognized as a cultivated species (Getinet et al. 1998). Even though the origin of sesame is still in debate, Mehra (1967) and Mahajan (2007) considered Ethiopia as the origin of cultivated sesame. Bedigian (1981) argues that, owing to the wide genetic diversity in East Africa (Ethiopia), it is reasonable to assume that this subcontinent is the primary center of origin and India would then be thought of as a secondary center for sesame. Sesam e seed, also known as sesamum, gingelly, benniseed, sim-simRead MoreImportance Of Diversity Between Species And Species1110 Words   |  5 Pagessource and importance of diversity with and between species using examples from the order Squamata, class Reptilia, comprising of over 9000 different species (Uetz, 2014) of lizards and snakes, (HABITATS) Diversity within and between species is created by genetic variation; a process that allows new traits to originate which will then become more or less prominent in a population through Natural Selection.The factors mainly responsible for this diversity can be traced mainly to genetic mechanismsRead MoreEvaluate the Importance of Ecosystem Management and Protection1135 Words   |  5 PagesEvaluate the importance of ecosystem management and protection An ecosystem is defined as a group of organisms and their biophysical environment interact and exchange matter and energy, collectively, they form an ecological system. By identifying the characteristic patters of interaction it is possible to distinguish different types of ecosystem. Many forms and features have been accountable for the destruction of different ecosystems. This has been achieved within the atmosphere-varies in temperatureRead MoreDetermining The Population Structure Of Salmo Salar1027 Words   |  5 Pages(Youngson et al 2003) explains that in the management of hatcheries, managers must make decisions based on population structure and genetic insight. This research would provide novel information that could inform better decision making in terms of the effectiveness and efficiency of the hatchery. The Atlantic Salmon is an appropriate fish to study because of it’s importance globally. It is a commonly eaten fish, and is very prevalently produced used in aquaculture techniques. In addition to that, it’s

Ib Biology Hl2 †6.1 (Digestion) Free Essays

6. 1. 1 Explain why digestion of large food molecules is essential. We will write a custom essay sample on Ib Biology Hl2 – 6.1 (Digestion) or any similar topic only for you Order Now There are two reasons why the digestion of large food molecules is vital. Firstly, the food we eat is made up of many compounds made by other organisms which are not all suitable for human tissues and therefore these have to be broken down and reassembled so that our bodies can use them. Secondly, the food molecules have to be small enough to be absorbed by the villi in the intestine through diffusion, facilitated diffusion or active transport and so large food molecules need to be broken down into smaller ones for absorption to occur. Summary: ? 1. Food needs to be broken down and reassembled. 2. Large food molecules need to be broken down into smaller ones. 6. 1. 2 Explain the need for enzymes in digestion. Enzymes are needed in the process of digestion as they are the biological catalysts which break down the large food molecules into smaller ones so that these can eventually be absorbed. Digestion can occur naturally at body temperature, however this process takes a very long time as it happens at such a slow rate. For digestion to increase in these circumstances, body temperature would have to increase as well. However this is not possible as it would interfere with other body functions. This is why enzymes are vital as they speed up this process by lowering the activation energy required for the reaction to occur and they do so at body temperature. Summary: ? 3. Enzymes break down large food molecules into smaller ones. 4. Speed up the process of digestion by lowering the activation energy for the reaction. 5. Work at body temperature. 6. 1. 3 State the source, substrate, products and optimum pH conditions for one amylase, one protease and one lipase. AmylaseProteaseLipase EnzymeSalivary AmylasePepsinPancreatic Lipase SourceSalivary GlandsChief cells in stomach liningPancreas SubstrateStarchProteinsTriglycerides such as fats and oils ProductsMaltoseSmall polypeptidesFatty Acids and Glycerol Optimum pHpH 7 pH 1. 5 – 2pH 7 6. 1. 4 Draw and label a diagram of the digestive system. ?Figure 6. 1. 1 – The digestive system 6. 1. 5 Outline the functions of the stomach, small intestine and large intestine. The stomach is an important part of the digestive system. Firstly it secretes HCL which kills bacteria and other harmful organisms preventing food poisoning and it also provides the optimum conditions for the enzyme pepsin to work in (pH 1. 5 – 2). In addition, the stomach secretes pepsin which starts the digestion of proteins into polypeptides and amino acids. Theses can then be absorbed by the villi in the small intestine. The small intestine is where the final stages of digestion occur. The intestinal wall secretes enzymes and it also receives enzymes from the pancreas. However the main function of the small intestine is the absorption of the small food particles resulting from digestion. It contains many villi which increase the surface area for absorption. The large intestine moves the material that has not been digested from the small intestine and absorbs water. This produces solid faeces which are then egested through the anus. Summary: Stomach: 6. Secretes HCL which kills bacteria. 7. HCL provides optimum pH for pepsin. 8. Secretes pepsin for protein digestion. Small intestine: 1. Intestinal wall secretes enzymes 2. Receives enzymes from the pancreas. . Has villi for absorption of food particles. Large intestine: 1. Moves material that has not been digested along. 2. Absorbes water. 3. Produces faeces. 6. 1. 6 Distinguish between absorption and assimilation. Absorption occurs when the food enters the body as the food molecules pass through a layer of cells and into the bodies tissues. This occurs in the small intestine which has many villi tha t are specialised for absorption. Assimilation occurs when the food molecules becomes part of the bodies tissue. Therefore, absorption is followed by assimilation. 6. 1. Explain how the structure of the villus is related to its role in absorption and transport of the products of digestion. The structure of the villus is very specific. Firstly there is a great number of them so this increases the surface area for absorption in the small intestine. In addition the villi also have their own projections which are called microvilli. The many microvilli increase the surface area for absorption further. These microvilli have protein channels and pumps in their membranes to allow the rapid absorption of food by facilitated diffusion and active transport. Also, the villi contains an epithelial layer which is only one cell layer thick so that food can pass through easily and be absorbed quickly. The blood capillaries in the villus are very closely associated with the epithelium so that the distance for the diffusion of the food molecules is small. This thin layer of cells contains mitochondria to provide the ATP needed for the active transport of certain food molecules. Finally, there is a lacteal branch at the centre of the villus which carries away fats after absorption. ?Figure 6. 1. – Intestinal villus? Summary:? 9. Many villi increase the surface area for absorption. 10. Epithelium is only one cell layer thick and so food is quickly absorbed. 11. Microvilli on the villi increase the surface area for absorption further. 12. Protein channels and pumps are present in the microvilli for rapid absorption. 13. The mitochondria in the epithelium provide ATP needed for active transport. 14. Blood capillaries are very close to the e pithelium so diffusion distance is small. 15. The lacteal takes away fats after absorption. How to cite Ib Biology Hl2 – 6.1 (Digestion), Essay examples

Advocacy For Improving Health Care Essay Example For Students

Advocacy For Improving Health Care Essay Advocacy in Population Health One only has to look back at the history of nursing to see why advocacy in the area of health for the population is so important. Florence Nightingale fought for change in nursing. Her advocacy for improving health care ultimately changed how nurses were viewed in our country and in the world. She knew that advocating change in the health care system was the only way to improve it. According to Mislead (2016), Involvement in policy decisions and political process is an integral part of the nursing role because of our history, practice, education, and professional organizations. As Advanced Practice Registered Nurses, (APRN’s) we have an obligation to improve health care by first recognizing the problems that affect our healthcare systems and, advocating change. Only when APRN’s take an active role of advocacy and change utilizing policy process will notable changes occur in health reform. APRN’s that join nursing organizations and make contact with legislators and other elected officials will have an easier time getting policies changed using the political process. (Milstead 2016). Let’s look at a problem of increasing deaths from heart disease in NC and see how the policy process will affect the outcome. The first step is to identify the problem. The problem is the unacceptable number of deaths in NC from cardiovascular disease, the acceptable range is 161.5, and North Carolina’s rate is currently 229.6. (North Carolina State Center for Health statistics, 2015). Using the Mobilizing for Action through Planning and Partnerships (MAPP) model we will start to address this problem. The MAPP model was a joint project of the non –profit National Association of County and Ci. .t needs it the most, has change been achieved? The process for evaluation of this program should start at the beginning of this process, and can include several methods, the quantitative and qualitative methods, the evaluation process can be very daunting and must be performed completely and efficiently. he evaluation of the program should be presented to numerous audiences , and with multiple opportunities for others to learn about the evaluation report ( Milstead,2015 ).The report should also include guidelines for change and improvement .The evaluation process will also tell us if the program was successful or areas where improvement is needed. Using the Mapp method evaluation is ongoing and even when programs are successful, they are also evaluated for improvement. Our program would be deemed successful if our number of North Carolina residents who