Definition of Postzygotic Isolation in Evolution

Speciation is the divergence of two or more lineages from a common ancestor. For speciation to occur, there must be some reproductive isolation that occurs between formerly reproducing members of the original ancestor species. While most of these reproductive isolations are prezygotic isolations, there are still some types of postzygotic isolation that leads to making sure the newly made species stay separate and do not converge back together. Before the postzygotic isolation can happen, there must be an offspring born from a male and female of two different species. This means there were no prezygotic isolations, like the fitting together of the sex organs or incompatibility of the gametes or differences in mating rituals or locations, that kept the species in reproductive isolation. Once the sperm and the egg fuse during fertilization in ​sexual reproduction, a diploid zygote is produced. The zygote then goes on to develop into the offspring that is born and hopefully will then become a viable adult. However, offspring of two different species (known as a hybrid) are not always viable. Sometimes they will self-abort before being born. Other times, they will be sickly or weak as they develop. Even if they make it to adulthood, a hybrid will most likely be unable to produce its offspring and therefore reinforce the concept that the two species are more suited to their environments as separate species as natural selection works on the hybrids. Below are the different types of postzygotic isolation mechanisms that reinforce the idea that the two species that created the hybrid are better off as separate species and should continue with evolution on their own paths. The Zygote Is Not Viable Even if the sperm and the egg from the two separate species can fuse during fertilization, that does not mean the zygote will survive. The incompatibilities of the gametes may be a product of the number of chromosomes each species has or how those gametes are formed during meiosis. A hybrid of two species that do not have compatible chromosomes in either shape, size, or number will often self-abort or not make it to full term. If the hybrid does manage to make it to birth, it often has at least one, and more likely multiple defects that keep it from becoming a healthy, functioning adult that can reproduce and pass down its genes to the next generation. Natural selection ensures that only the individuals with favorable adaptations survive long enough to reproduce. Therefore, if the hybrid form is not strong enough to survive long enough to reproduce, it reinforces the idea that the two species should stay separate. Adults of the Hybrid Species Are Not Viable If the hybrid can survive through the zygote and early life stages, it will become an adult. However, it does not mean that it will thrive once it reaches adulthood. Hybrids are often not suited for their environment the way a pure species would be. They may have trouble competing for resources such as food and shelter. Without the necessities of sustaining life, the adult would not be viable in its environment. Once again, this puts the hybrid at a distinct disadvantage evolution-wise, and natural selection steps in to correct the situation. Individuals that are not viable and not desirable will most likely not reproduce and pass down its genes to its offspring. This, again, reinforces the idea of speciation and keeping the lineages on the tree of life going in different directions. Adults of the Hybrid Species Are Not Fertile Even though hybrids are not prevalent for all species in nature, there are many hybrids out there that were viable zygotes and even viable adults. However, most animal hybrids are sterile at adulthood. Many of these hybrids have chromosome incompatibilities that make them sterile. So even though they survived development and are strong enough to make it to adulthood, they are not able to reproduce and pass down their genes to the next generation. Since, in nature, fitness is determined by the number of offspring an individual leaves behind and the genes are passed on, hybrids are usually considered unfit since they cannot pass down their genes. Most types of hybrids can only be made by the mating of two different species instead of two hybrids producing their own offspring of their species. For instance, a mule is a hybrid of a donkey and a horse. However, mules are sterile and cannot produce offspring, so the only way to make more mules is to mate more donkeys and horses.

Breast Cancer Risk Factors and Treatment Essay examples

Breast Cancer What would you do if you found out you had breast cancer? Who would you tell first? How would you deal with it? The diagnosis of breast cancer is becoming more common today; we need to know what the symptoms are, and how to help prevent it. Breast cancer is the leading reason of death in women in the United States; it has increased greatly over the last 30 years. Many people wonder why it has increased so much in the last few years, and there are many reasons that it has. Breast cancer is a malignant, metastasizing tumor of the mammary gland. It is the leading cause of death in women between the ages of 35 and 45 years old, but it is most common in women over the age of 50. Almost 90% of all breast cancer begins in the†¦show more content†¦Age plays a very big part in the risk factors of breast cancer (Risks and Prevention). Being female also affects your risk of getting breast cancer. Being female is the most important risk factor for getting breast cancer. Although men can develop breast cancer, it is about 100 times more common among women (Risks and Prevention). Inherited genetic mutations can also increase your risk for breast cancer, although it is not very common today. It is most common among Jewish men and women. Researchers discovered that only about 2% of men and women who were diagnosed with breast cancer in the United States have a link to genetic mutations in their family. It is most common among Jewish men and women (Types of Breast Cancer). Childbearing is another factor that affects your risk of developing breast cancer. The link between having children and developing breast cancer is very complex. Both the number of children you gave birth to, and the age you were when you had your first child have a big affect on your risk. If you haven’t had any children yet, your risk will be lower than a woman who has had five children, and is expecting again (Risks and Prevention). 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Case Study negotiation & Conflict Management Guarded Neighbourhoods

Question: Discuss about the Negotiation and Conflict Management for Guarded Neighbourhoods. Answer: 1: Analysis of case study and evaluating conflicts Conflict faced by the people of Kuala Lumpur Payment for security guard- The guarded neighbourhoods have become a trend in Kuala Lumpur. The residents have put a lot of efforts for implementing a scheme for increasing their safety and security (Acharya, 2014). However, the security guards are the local goons who forced people to pay them money for protecting their lives from these guards only. Security guards consist of gang members- The Malaysian security services have admitted themselves that the security companies are supported by gangs. Many of the residents associations are being guarded by the gang members, thugs or ex-convicts (Altmae et al., 2013). Forcing people for continuing the services- These associations have been forced to continue with this service and pay them unless they do not want these criminals and gang members to cause any trouble to them. Hence, it has caused the people of Kuala Lumpur with huge loss of money and resources. These groups fight among themselves to prove their supremacy over rival group (Antia et al., 2013). These fights result in injuring many people and even death on several occasions. Fight among rival turfs- There has been a case of recent fights or turf wars among these gangs in Bandar, Klang and Bukit Raja. Someone from one of these associations have even commented that the reason for hiring these gang members for security guard is their low rates (Atorough Martin, 2012). Some of them even broke gate of the guard post of one of the resident while fighting. The people are facing problem while getting rid of these people. Gangs are expanding territory- The gangs are even expanding their boundaries for gaining more and more profit. Each of the housing area in Kuala Lumpur is expending RM2000 on these gang controlled security system (Conine Leskin, 2016). These companies hire the criminals, gang members and ex-convict because they are cheaper than the trained armed guards. They charged almost R5 hourly but they are not efficient. 2: Effect of conflict on the society of Kuala Lumpur Conflict has a severe effect on human society and despite many affects for resolving the conflict; it has a very crucial impact on the human society. Distracting people from their objective: Conflict has caused distracting groups and individual from their central goal. It would let them with less time for doing their activities (Day, 2015). The conflict involves heavy and contentious tactics for affecting human individual. It has caused hazard for the gangs and criminals as well as the people residing in the area. Their time and resources would get wasted from this diversion. Hence, the security guards are the local goons who forced people to pay them money for protecting their lives from these guards only. The residents associations are being guarded by the gang members, thugs or ex-convicts. Disrupting normal lives of people: Conflict can have both short and long time effect on the humans. It hampers the psychological and physical condition of the people of Kuala Lumpur (Gross et al., 2016). The long term effect on mind of people would cause permanent effect on their coping mechanism. These type of conflicts causes minor shock on the people and results in long and detrimental effect on the people. The long lasting effect of these conflicts not only affects the individual capital but also affects the educational outcome, health situation, and market condition of Kuala Lumpur. It also results in destructing the infrastructure of operations. Intergroup tension: Conflict not only hazards the people of Kuala Lumpur physically but also causes creating trauma over the people. The unchosen trauma could be transmitted to future generations (Huang et al., 2016). The rivalry and conflict of gang members can transfer from one generation to other. It would cause various changes on both the parties. The people would overlook on the fact of the peace matters. People would care about their life and security rather than their neighbours. The absence of peace and satisfaction among humans would result in growth of disorientation among the persons of Kuala Lumpur. Increased bitterness: Conflict causes the increase in the bitterness among the people. The people facing problems due to the conflict among these groups have caused bitterness among people against these gangs (Moore, 2014). The bitterness and hatred among people would be increased. It has caused the people of Kuala Lumpur with huge loss of money and resources (Ofori, 2013). These groups fight among them to prove their supremacy over rival group. Bloodshed and Conflict: The destruction and bloodshed among the gang members have been caused due to these conflicts. It has caused disruption in the normal lives of the people (Ofori, 2013). The tension and trauma has been observed in the lives of people of Kuala Lumpur. They would form bitterness with the gang members who would charge them with money as protection money. The resources and conversations would become limited and it would form a foster sense of aloofness from the other. The exposure to the gang conflicts and turf wars would result in damaging the daily life of the people. Hence it can be said that the effect of these conflict over the society of Kuala Lumpur is very hazardous. The society of the Kuala Lumpur has to face various situations for proper functioning of their society (Pines et al., 2014). The society of the place would have to face situations like distracting people of Kuala Lumpur from their objective, disrupting normal lives of people, intergroup tension, increased bitterness, and bloodshed and conflict. All these issues have to be dealt by the people and hence it would cause growth and hatred in the people. 3: Explaining the Thomas Kilmann model for conflict management Thomas Kilmann modes for resolving conflict in Kuala Lumpur The Thomas Kilmann modes for conflict management are a tool that is widely used for helping people in understanding the different styles of conflict handling. The five modes of Thomas Kilmann Conflict Modes are competing, compromising, collaborating, avoiding, and accommodating. The modes of Thomas Kilmann have become very popular for conflict management. It has helped in facilitating the use of five situation specific style for managing the conflict effectively. The Thomas Kilmann mode would be helpful for conflict management in the guard security of Kuala Lumpur. The four factors of Thomas Kilmann are assertiveness, unassertiveness, cooperative, and uncooperative (Acharya, 2014). Hence, from the figure the three modes that can be useful for solving the problems of guard in Kuala Lumpur are accommodation, competing and compromising. Figure 1: Thomas Kilmann conflict modes (Source: Ofori, 2013, pp- 500) Accommodation Definition- Accommodation is unassertive and cooperative and it is completely opposite to the competing (Tan, 2016). It has an element of individual neglecting for satisfying the concerns for yielding anothers point of view. It refers to the adjustment of problems. The people would be largely benefited by the implementation of this mode. In this mode the people have to frequently use it for adjusting to the conflict style (Altmae et al., 2013). The styles of the personal beliefs, values and motives push the people for consistent conflicting. The accommodating would help in acceding with the other party. Explanation- The people would have to accommodate the situation for maintaining the harmony of the place. The situation had been very hard for the people of Kuala Lumpur (Antia et al., 2013). The people would have to accommodate to the current situation. The gangs would have to accommodate to the situation of the problem. The resident association and security services association in Malaysia could implement the accommodation for forming balance in between the assertiveness and cooperativeness. Accommodation would help in forming and focusing on the needs of others and form a mutual relationship in between (Atorough Martin, 2012). The people of RA and PPKKM would look after each other and form a party. They maintain harmony and mutual relationship for forming the assessing the relation. It forms the positive cooperativeness and negative assertiveness. Accommodation mode is helpful in assessing a wide range of application for conflict management, team building, leadership development, performance improvement, stress reduction, and retention. It would play an important role for identifying the various conflict handling styles for choosing appropriate style relevant to any situation (Trippe Baumoel, 2015). It improves team functions by motivating members for reconciling differences and working as a team. Example- Suppose there is flat and two people who want the same flat. It would give rise to conflict among them for procuring the place. However, if they share the flat using accommodative conflict management, it would help both of them to sort out their problem. Competing Definition: In competing, the mode is assertive and very uncooperative. It can also be termed as power oriented mode of conflict management (Prenzel Vanclay, 2014). Competing means standing against other for ones right. The person has to pursue his or her individual concern even at others expense. They have to defend their position for only wining the situation. Explanation: The competition would be helpful for removing the uncertain and gang security system of the Kuala Lumpur. The people would be assertive for dealing with the security guard issue of the Kuala Lumpur (Conine Leskin, 2016). Competing mode would be helpful for taking stern decisions against the ill treatment by the gang members and criminals. The competing would mean to distinguish their needs with the greed of the gang members. The competing nature of the mode is highly assertive and not at all cooperative. The competitive mode of model would be highly partiality (Day, 2015). The sum orientation of the operations would be with highly struggle. The resident association and PPKKM would stick to their own ways for gaining profit. The system would be highly competitive and it would result in chaos and problem. Each of the party would be sticking to their own ideal and they would convince other for agreeing to their terms. The individual attempts for working in collaboration wi th the other people for forming the fully satisfaction of the individual (Redpath et al., 2013). They struggle to form supremacy over the other party. Its a win or lose situation for them. Anyone would have to win and other would have to loss. Example- In an exam, all the students compete against each other for securing the top most position. It is a form of healthy competition and only one of them would win in the case. Hence, competing against each other for proving their superiority would also help in ending the conflict. However in most cases its results are not healthy. Compromising Definition- Compromising is an intermediate form for finding the expedient for splitting the differences, concessions and middle ground position. It does not help in addressing the conflict. The diplomatically form of sidestepping in the issue and it postponing the issue for a better time of solution. The people would have to compromise with the situation and form balance in between the situations that has been arisen (Gross et al., 2016). The people have started to feel hatred and bitterness against the situations of the Kuala Lumpur security system. Explanation- It is an intermediate form in between assertiveness and cooperativeness. Compromising refers to the situations where both the parties understanding the issues and form an intermediate decisions that favour both the level. The resident association and PPKKM would have to form a minimally acceptable layer for all parties. Compromising means to form a middle situation that could be acceptable for each of them (Huang et al., 2016). It is a minimally acceptable situation for both the parties. In this situation, both the party would compromise at some level. Hence they would form a intermediate form for compromising. Both the parties talk and came to a mid-strategic level where they would select some of the parts from each party. The two persons might take each others sight for resolving the competing and confronting. It would help in procuring one on one and also group discussion. Hence, it would be able to eliminate any chances of miscommunication (Tedong et al., 2014). It e nhances leadership for managing the conflict by effective skills of action. It would help in overcoming the barriers that may hinder the progress and performance. The stress can be reduced by using the modes of this model (Wolff Yakinthou, 2013). It gives people a chance for overcoming the workplace stress by giving them the right tools and capacity. Example- In the case of mutual settlement of court cases, both the parties have to compromise some of their demands for forming a pact that could be acceptable by both of them. References Acharya, A. 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Beyond the ThomasKilmann Model: Into Extreme Conflict.Negotiation Journal,31(2), 89-103. Wolff, S., Yakinthou, C. (Eds.). (2013).Conflict management in divided societies: theories and practice. Routledge.