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What is natural selection mini essay
What is natural selection mini essay
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INTRODUCTION:
My project question is: has human development disabled the power of genetic mutations and natural selection or enhanced it? My aim is to understand the importance of natural selection and the impact that human development has had on it. According to The Concise Oxford Dictionary(p 334), human development is defined as the process of enlarging people’s freedom and opportunities and overall well being through various resources. I will research the effect that the progression of humans, in terms of their developments, has had on the abnormalities that have come to occur. I chose to do this topic because only in the last 5 to 10 thousand years of humans existence on the planet earth has a distinct difference in the DNA structure of the human begun to arise. These differences are of recent occurrence. A population explosion was intense up until two decades ago (Paul and Anne Ehrlich,1989) and it is a great interest of mine to understand what influence it had on the mutations that have come to occur. I aim to have a better understanding of whether the majority of the mutations that are occurring are beneficial and therefore encouraging the human races survival or harmful and therefore causing its demise.
“A mutation is a sudden and unpredictable change in the genetic structure of an organism” (Mind Action Series: Life Science Textbook and Workbook Grade 12 FET, 2010). Mutations can be somatic, which means they occur in the somatic cells which have a full set of chromosomes but they are not used to carry hereditary information to future generations. Mutations can also be germ line, which occurs in the germ cells which come together to form the embryo and are therefore passed on to offspring. Mutations can be caused by chro...
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...conclusion that: human development has enhanced the power of natural selection and genetic mutation rather than disabling it.
LIMITATIONS:
A limitation to my research would have to be the fact that there was no evidence that could give a final, complete answer as to whether human development has disabled the power of natural selection and genetic mutations or enhanced it. Although the various research has been undertaken in order to get close to discovering the answer, a definite answer has not been achieved.
The only other limitation that I encountered while doing my research was the fact that i was limited in available hard copies that I could use for my research. The magazines and encyclopaedias that I looked at were insufficient in helping me prove my question and I therefore turned to online articles and information to help me unpack and answer my question.
The second article I have chosen to evaluate for this topic is The Designer Baby Myth written by Steven Pinker. This article starts off by explaining how many people fear the idea of genetic enhancement. Several citizens are concerned about creating the ultimate inequality or changing human nature itself. Many will say technology in medicine is increasing to the point where genetic improvement is inevitable. Steven presents his position on the matter in his thesis statement; “But when it come to direct genetic enhancement-engineering babies with genes for desirable traits-there are many reasons to be skeptical.” He makes it clear that genetic enrichment is not particularly inevitable or likely in our lifetime. He bases his skepticism around three sources; the limits of futurology, science of behavioral genetics, and human nature.
“The term “nature versus nurture” is used to refer to a long-running scientific debate. The source of debate is the question of which has a greater influence on development: someone's innate characteristics provided by genetics, or someone's environment. In fact, the nature versus nurture debate has been largely termed obsolete by many researchers, because both innate characteristics and environment play a huge role in development, and they often intersect”. (Smith, 2010 p. 1)
A permanent change in the DNA sequence which makes up a gene is what is referred to as gene mutation (Mahoney & Springer 2009). It is believed that gene mutation occurs in two ways: that is, it can be acquired in personal lifetime or inherited from a parent. Those that are passed from parents to the child are referred to as hereditary mutation. They acquire the name since they are present in the eggs and sperms or the germ cell. In this case, such kind of mutation is present all through one’s life in almost every cell in the body. A similarity in mutation and gene diversity is the change in the DNA sequence which makes both mutation and genetic diversity have related issues.
The nature vs. nurture debate: the nature side, are those such as biologists, psychologists and others in the natural sciences, argue that behavioral traits can be explained by genetics. Those taking the nurture side are sociologists and others in the social sciences, they argue that human behavior is learned and shaped through social interaction. This argument should be dismissed because you don’t have to look far to see that both genetics and our environment, plays a role in who we are and our behaviors. (Glass). The point is there is a complex relationship between nature and nurture, either one alone is insufficient to explain what makes us human. (Colt). Our heredity gives us a basic potential,...
It is important to note that genes themselves do not cause disease genetic disorders are caused by mutations that make a gene function improperly. For example, when people say that someone has the cystic fibrosis gene, they are usually referring to a mutated version of the Cystic Fibrosis Transmembrane Conductance Regulator gene, which causes the disease. All people, including those without cystic fibrosis, have a version of the Cystic Fibrosis Transmembrane Conductance Regulator gene.
There were major shifts in human development over different times of human existence, two of
According to Darwin and his theory on evolution, organisms are presented with nature’s challenge of environmental change. Those that possess the characteristics of adapting to such challenges are successful in leaving their genes behind and ensuring that their lineage will continue. It is natural selection, where nature can perform tiny to mass sporadic experiments on its organisms, and the results can be interesting from extinction to significant changes within a species. Human beings are no exception to biological evolution. Like other organisms around the world, humans have significantly changed over time and have developed all sorts of diverse characteristics.
This chapter discusses The Evolutionary Perspective, Genetic Foundations, reproductive Challenges, and Heredity-Environment Interactions. Natural selection is the process by which those individuals of a species that are best adapted survive and reproduce. Darwin proposed that natural selection fuels evolution. In evolutionary theory, adaptive behavior is behavior that promotes the organism’s survival in a natural habitat. Evolutionary psychology holds that adaptation, reproduction, and “survival of the fittest” are important in shaping behavior. Ideas proposed by evolutionary developmental psychology include the view that an extended childhood period is needed to develop a large brain and learn the complexity of human social communities. According to Baltes, the benefits resulting from evolutionary selection decrease with age mainly because of a decline in reproductive fitness. At the same time, cultural needs increase. Like other theoretical approaches to development, evolutionary psychology has limitations. Bandura rejects “one-sided evolutionism” and argues for a bidirectional lin...
Evolutionary theory is developed from Darwin’s argument that “suggests that a process of natural selection leads to the survival of the fittest and the development of traits that enable a species to adept to its environment. “ Many have taken this a step further by saying that our genetic inheritance determines not only our physical traits but also certain personality traits and social behaviors. There is such a controversy over significant behaviors that unfold because many believe that we are already pre-programmed human species. It has also been argued that evolution is reflected in functioning and structure of the nervous system and that is has evolutionary factors that have a significant influence on everyday behavior. With what is being said means that if we follow the evolutionary theory, then it would be said that we are already pre-programmed from before birth to follow certain protocols in life. Whether it is from finding a mate or by getting a job. It also believed that this theory gives use cues from our own system to follow, providing us with certain aspects of life from our ancestors. By believing in this theory we can determine that the importance of heredity when influencing human behavior. Behavioral geneticists and evolutionary psychologists have both agreed that not only do genetic factors provide specific behaviors or traits but it also shows the limitations on the emergence of such traits or behaviors. What this means is that our genetics will determine how tall we will be to how ...
"Eugenics, Genetic Engineering Lite." The Future of Human Evolution. Humans Future, 2010. Web. 14 Feb 2012.
As previously stated, there are several ways that these changes can occur, but the ones I will be focusing on are changes occurring to methyl and acetyl groups. The mechanism of heritability in animals is information coded into genes. Genes are wrapped around histones in the nucleus. When methyl groups attach to these histones, it winds the genes tighter, and since the shape is altered, it also alters the protein the gene codes for. Generally speaking, when you add a methyl group onto the histones, or "spool" of the gene, it makes it harder to code that gene’s proteins, just like if you got something stuck in the chain on your bike and tried to pedal it. The more methyl groups that build up, the worse the problem becomes. However, in most of the cases acetylation unwinds some of the histones, activating or reactivating a gene. Scientists are explo...
Mutation happens when the DNA gene gets changed, moves, or is damaged. When this happens it causes the genetic message to be carried by that gene to be different. This process can occur in somatic cells. The somatic cells are all the cells that are a living organism except the reproductive cells, meaning the body. For example, the skin cells on your legs are and will not be passed on to ones offsprings. In addition those leg cells will not effect the evolution. Another occurrence is called gametic mutations, which is in a woman's eggs and or in a man's sperm. These are cells that are and can be passed on to ones offsprings, and they are the essentials for the evolution. There are three effects mutation causes to a species. Species can only takes on one of the three. The three effects are bad, neutral, and good. Having a bad mutation can cause one to have a harder time being able to survive. Having a neutral mutation will not change or help one to survive. Having a good mutation will help one to survive and have a better chance of survival. However, mutation is random in the evolution, and provides raw material for natural selection, genetic drift, and gene flow...
A genetic mutation is a permanent change in the sequence of the DNA that makes up a gene. A mutation of these sorts can be caused by either inheritance from the parent or caused sometime during the life of someone. The mutation that has been inherited is called a germline mutation. Germline mutations affect virtually the entire body, and they seem to be present in every cell. A somatic mutation, or one that is caused in the DNA of a single cell sometime during the life, can be caused by an environmental factor or a wrong bonding in the DNA molecule. These cannot be passed down to the next generation of children because they occur in a specific cell as opposed to in a reproductive cell. Some mutations occur in the embryo as it is growing. These may occur during cell division, and some of the cells may or may not inherit this mutation. Some mutations are extremely rare, and others are incredibly common. Those that occur in more than one percent across a population are considered polymorphisms. Polymorphisms are considered normal variations in DNA, and they are known to cause simple changes such as variations in blood types and hair color. Although these are not typically fatal, they can influence the creation of some disorders (Lister Hill National Center for Biomedical Communications, U.S. National Library of Medicine, National Institutes of Health, Department of Health and Human Services, USA.gov, 2013).
What is a mutation ? A mutation is when there is a change in one's DNA sequence . In an animal’s lifetime, the DNA undergoes some changes into a mutation sequence of bases . There are four bases (A) Adenine, (C) Cytosine, (G) Guanine, and (T) is for Thymine .
The first force of evolution is referred to as mutation and remains the only source of new genetic material or alleles. Mutation occurs during DNA replication, instead of the identical replication, an error occurs during the process. Basically, something is tweaked during replication that changes the bases of a gene. If the problem is not detected and corrected,a mutation results. As the book articulates, so much of DNA is non-coding that many mutations will not affect an individual's health or well-being, but a mutation in coding DNA will cause a different outcome, whether it be positive or negative. Mutations that occur in gametes are the ones that will change future generations. There are different types of mutations that are caused by numerous