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History of human evolution
History of human evolution
History of human evolution
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Throughout the history of evolution there have been many different methods and ideologies that have affected the gene pools and phenotypes of species, one of those being "Artificial Selection". Artificial Selection is when humans breed animals of the same species together to create a specific overall trait. (Wikipedia, Learner.org, 2010) A great example of artificial selection is the history of dog breeding. Throughout history humans have bred dogs to further develop more ideal physical and behavioral characteristics, and through it we achieved this wide range of different domesticated dog breeds that are very different from their ancestors, both physically and behavioral.
There are many theories obtaining to how dog breeding began. One of the most popular ones being that humans would rescue orphaned wolf puppies and nurse them back to health. As the puppies got nursed back to heath, they would then grow accustomed to living with humans. From there humans would use them for hunting companions, pest control and “guard dogs”. (Dogtime, 2009) Eventually humans would see that certain individuals were better for certain tasks than others. For instance one individual that was a very fast runner, but rarely barked made for a good hunting companion. However, another that wasn't good at running, but would bark at strangers made for a good guard dog. People would see these characteristics and would specifically breed individuals to concentrate certain traits, Such as breeding two dark-haired wolves to get dark-haired offspring, or two large and intimidating wolves to get large intimidating offspring. With these specific breeds being created, the offspring of the various pairings would either have very similar characteristics between one a...
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...helped widen the gene pool within the species. Through it we not only made domesticated dog breeds very different from their ancestors both physically and behavioral, but also within all the different breeds. It gave the species diversity that it never would have created on its own naturally in the wild.
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Every year an estimated 4.5 million dog bites occur in the U.S. BSL (Breed Specific Legislation) is a law that suggests that certain breeds are more prone to aggression than others. By banning or restricting the breeds in question, it is believed to help reduce the number of attacks. BSL determines which breeds are dangerous using statistics. These statistics cannot be relied on for two reasons. One, there is no concrete method to determine a dog’s pedigree. Thus, a victim, animal control officer, or owner is trusted with identifying the dog through appearance. According to Scott and Fuller, authors of Genetics and the Social Behavior of the Dog, “It has been known for decades that the cross-bred offspring of purebred dogs of different breeds often bear little or no resemblance to either their sires or dams (1965).” Visual assessments are questionable. Two, population is not accounted for. Population is important, in that it provides context to percentages. Because a dog’s breed is impossible to pinpoint, we cannot provide numbers. BSL’s cause is rendered useless when we consider these points.
Take a moment and picture a dog in your head. What do you see? You may see many different things depending on your own personal encounters with the species. There are many types of dogs out there. Some small, some large, long-haired or short-haired. There are many variances in what a dog can look like. One thing that does not change, or should not change, is the importance for every dog in this world to be given love and affection, no matter its characteristics. This is what leads me to believe that the obsession with producing and owning purebreds needs to come to a halt. Continuing to create these so-called “best dogs” is dangerous to not only the purebred’s health, but also devalues mixed breeds and can cost them their lives in animal shelters where they may never escape. My interest in this topic caused me to look into seeing what other people felt about it.
1. The way in which the process of learning is the result of Natural Selection is by the way we learn on how to live our life and to survive to be able to make offspring. Our book says that “those of their offspring that share their parents ' advantage will also tend to survive and reproduce” (Chance,2014). There is also the example in the book of Gregor Mendel in which he did the experiement with the peas and with natural selection he was able to have a garden full of peas. And last there is the experiment of the birds with different shapes of beak Charles Darwin said that "it is very remarkable that a nearly perfect gradation of structure in this one group can be traced in the form of the beak, from one exceeding in dimensions that of the
There are many theories’ that dog got evolved by the grey wolf but current resources say that dogs. The PLoS (is an open access peer-reviewed academic journal published monthly by PLOS Genetics) say that dogs may have not evolved by the grey wolf or least not the grey wolfs that we have living up in our northern forest. One possibility is there may have been other wolf lineages that these dogs diverged from that, then went extinct. But there
...tion, including their initial evolution, their domestication, and the roles they played in human society throughout the ages. It is a relatively new book being published in 2010. Darcy Morey, the author of this book is a zooarchaeologist and focuses his research on the relationship between dogs and humans throughout time. He is a graduate of the University of Tennessee. This book is based on the authors own research and also refers to the information gathered by many other scientists, all of which are listed in the reference section of the book. As mentioned this book contains the results of research from many scientists and is beneficial for learning both general and more scientific knowledge on the subject. I would recommend it to anybody who is conduction a research on the topic. This book was found using I-Share using the search term the domestication of dogs.
However, the hunters would not keep all of the wolves that grew up from the cubs they had. Keeping a wolf that became overly aggressive towards them, or if it had little practical use, would have been both pointless and dangerous to their group. They most likely would have killed those types of wolves or left them behind to fend for themselves. The hunters would have chosen semi-tame wolves and those with the most desirable traits and abilities and bred the two together, repeating the process until what resembled a dog today. The first bones found which ...
Have dogs always been cute and cuddly? Actually, they have not always been how they are today. All dogs used to be big bad wolves. Scientist has found that all dogs have descended from the grey wolf. They converted into dogs because the wolves came closer and closer to humans. It took a very long time for the wolves to alter to cute cuddly dogs. After the wolves had pups, the pups grew up around humans and grew closer and less ferocious to humans, so the pups were more comfortable with people and that we could hunt with them and use them as pets later. Therefore, the relationship between dogs and humans has changed tremendously over time.
This chapter covers the variations of selection. Selection is a process, a description of how genes that produce better adaptations become more frequent over time. Species don’t try to adapt to their environment. Adaptation to the environment is inevitable if a species has the right kind of genetic variation. (pg. 117) The thought that “everything happens by chance” is essentially wrong. Evolution by selection is a combination of randomness and lawfulness. First a “random” process is the occurrence of mutations that generate an array of genetic variants, both good and bad; and then a “lawful” process (natural selection) that creates these variations. (pg.118) DNA is random, and this shows in humans and animals. For example, a humans parents
Charles Darwin’s theory of natural selection explains the general laws by which any given species transforms into other varieties and species. Darwin extends the application of his theory to the entire hierarchy of classification and states that all forms of life have descended from one incredibly remote ancestor. The process of natural selection entails the divergence of character of specific varieties and the subsequent classification of once-related living forms as distinct entities on one or many levels of classification. The process occurs as a species varies slightly over the course of numerous generations. Through inheritance, natural selection preserves each variation that proves advantageous to that species in its present circumstances of living, which include its interaction with closely related species in the “struggle for existence” (Darwin 62).
Later on they were bred as companion animals. The different variations of domesticated dog will be discussed later. The down fall of artificial selection is that it decreases variation in a species. Pure bred dog are highly susceptible to many different disorders and disease because of the lack of variation in their genotype. With these two processes, today we have friendly canine
Everyone should have heard this phrase that dog is man’s best friend. We live with them, love them, and take good care of them. When people talk about dog breed, the advantages and disadvantages of purebred dogs is always a controversial issue. Lots of people like purebred dogs because they are beautiful and cute; some people prefer crossbred dogs because they believe purebred dogs usually have genetic disease. Indeed, many evidence and research show that purebred dogs are easier to have genetic disease, and many purebred dogs die from incurable genetic disease every year. However, people still do not pay highly attendant to this problem. Even though purebred dogs are pretty, cute and inherited pure blood compared with the mixed-breed dogs, people should not excessively breed purebred dogs in order to satisfy our desire because a lot of them suffer serious genetic disease, are abandoned on the streets and performed euthanasia in shelters.
The transition to the diet of the original dog as a result of beginning the relationship with humans could be attributed to the changes identified between the modern dog and original dog (wolf). The canids remain recovered in yet cave, in Belgium where Upper Paleolithic artifacts were discovered along with other object are considered to be domesticated dogs. The domestication of dog could have been driven by human need for help with herding, hunting, and early warning while the dog benefited from companionship and reliable source of food
With the studies that Charles Darwin obtained he published his first work, “The Origin of Species.” In this book he explained how for millions of years animals, and plants have evolved to better help their existence. Darwin reasoned that these living things had gradually changed over time to help themselves. The changes that he found seemed to have been during the process of reproduction. The traits which would help them survive became a dominant trait, while the weaker traits became recessive. A good example of what Darwin was trying to explain is shown in giraffes. Long-necked giraffes could reach the food on the trees, while the short-necked giraffes couldn’t. Since long necks helped the giraffes eat, short-necked giraffes died off from hunger. Because of this long-necks became a dominant trait in giraffes. This is what Charles Darwin would later call natural selection.
A breed is a particular set of domestic animals or plants having uniform look and behavior, that differentiate it from other animals or plant. While as Domestication is the process whereby a population of living organisms is changed at the genetic level, through generations of selective breeding, to accentuate traits that ultimately benefit humans. The deliberate breeding of animals and other species to get required features by human beings is called selective breeding. It includes breeding methods such as inbreeding, line breeding etc. The animals that are produced are tamed, and the breeding is usually done by an expert breeder.
Many scientists in the past, such as Aristotle and Plato, believed that there were no changes in populations; however, other scientists, such as Darwin and Wallace, arose and argued that species inherit heritable traits from common ancestors and environmental forces drives out certain heritable traits that makes the species better suited to survive or be more “fit” for that environment. Therefore, species do change over a period of time and they were able to support their theory by showing that evolution does occur. There were four basic mechanisms of evolution in their theory: mutation, migration, genetic drift, and natural selection. Natural selection is the gradual process by which heritable traits that makes it more likely for an organism to survive and successfully reproduce increases, whereas there is a decline in those who do have those beneficial heritable traits (Natural Selection). For example, there is a decrease in rain which causes a drought in the finches’ environment. The seeds in the finches’ environment would not be soft enough for the smaller and weaker beak finches to break; therefore, they cannot compete with the larger and stronger beak finches for food. The larger and stronger beak finches has a heritable trait that helps them survive and reproduce better than others for that particular environment which makes them categorized under natural selection (Freeman, 2002).