Monday, June 1, 2015

Variation and Race

1.      High levels of solar radiation is an environmental stressor which negatively impacts the survival of humans by disturbing homeostasis; radiation occurs from solar storms in the universe. This produces UVA rays which penetrate through human skin going through the epidermis layer and causing defects in the human cells.  Then there is the UVB rays that goes through our skin and that cause’s cell deformation, skin cancer, and this genetic level disturbs homeostasis and is harmful to our survival.

2.      Short term adaptation for solar radiation is hard to say since there isn’t really one other than stay out of the sun.
          Facultative adaptation to protect us from the harmful UVB radiation waves is skin tanning and tanning happens when exposure to sunlight triggers a protective mechanism through increased melanin production in the epidermis layer.   The more time spend in the sun during the summer months with the warmer weather, it is common to see people of both fair and dark skin have a darker complexion.
           Developmental is in populations that have been exposed to a large amount of solar radiation and so therefore their skin has become dark to help protect themselves for an over absorption of UV rays.  People who live in the Savannahs of Africa or tropical places have dark skin and are able to withstand higher levels of solar radiation exposure.  You can see the proven correlation between people’s skin color and living environments. 
          Cultural adaptation to the harmful UVA and UVB rays are clothing, shelter, hats, sunscreen lotions and sprays.  Clothing and shelter made it possible to limit exposure to the sun’s radiation and therefore reduced the need for such high levels of melanin production.  Migrating to other environments such as forested areas also reduced our time in the sun and see the change in skin pigmentation with the lighter skinned populations possessing more of the northern geographical regions and darker skinned populations possessing more central and southern regions closest to the equator.  Now people of all skin pigments now populate all regions of the globe and instead of migrate northward if you are light skinned, the invention of sunscreen lotion can protect you for longer periods of time in the sun. 

3.       The benefits of studying human variation is to understand the changes of various sample populations over time, human adaptation and to evaluate and see the environmental stressors.   For example, by studying UV radiation we discovered it causes skin cancer or by studying skin cancer we found that it is caused by UV rays.  Either way we need to determine what levels are acceptable to the human body and what amount is needed to survive in order for the body to produce the proper levels of vitamin D. 


4.      I would use race only to classify geographic groups of people who have the same or similar set of adaptations to the same environment and this will help with understanding their ancestral traits and able to keep track of when population may have migrated due to environmental stresses. Studying the environmental influences of a group of people over long periods of time you see patterns which evolved as adaptations to those outside stressors and some adaptations like being born with lighter or darker skin become permanent, while others will remain until the stressor has been removed such as tanning during the summer with increased sun exposure.  I believe that being able to study the human species is a great tool to help people overcome racism and see more of the ways we are alike than the ways in which we differ and that certain traits have been developed due to a change in the environmental influences.

Tuesday, May 26, 2015

Language Blog

Part 1
1.      This was funny and interesting activity.  My partner was talking like he normally does and I communicated with facial expression and gestures.  But it got hard because he was asking me a questions and it was hard for him to understand my response.  Yes at the end my partner did alter his communication because he said I look ridiculous and we were just laughing the last few minutes.

2.      My partner was in control of the conversation. He brought up the subjects and started the conversations.  I tried answering which was easy for yes or no question or what my opinion was on something.  I asked a couple questions my pointing to my partner like what do you think and he understood that.  But he definitely had the power of the conversation and I felt the opposite because I just couldn’t put my responses in body language.


3.      .   The culture with the language is the one who has the advantage communicating complex ideas to a population through signs is very hard.   The speaking language probably find it difficult to understand those that do not use the symbolic language.  For me this felt like a person who came from a different country and knows no English, they try to communicate and make their message come out through this way. It is hard for the person because they don’t understand what the person is saying nor can they tell them what their feeling as well.

Part 2
1.      I am the type of person who talks with facial expressions and my hands all the time, so this was difficult.  My partner found it amusing the lack of body language I had, I was very mono tone and I was having a slow conversation because I was trying hard to concentrate not to do anybody language.  My partner was also concentrating on what I was saying as well and he said it was weird that I wasn’t showing emotions but understood me.

2.      This show how the importance of body language and facial expression.  Non speech is important to communicate effectively like my partner said I was emotionless.  Non speech and language goes together it tells the story and the non-speech gives the story feelings to it.  Humans receive information about your words through the tone (high, low, loud, screaming, quiet, etc.)  And facial expression.


3.      Body Language shows a person’s feelings and emotions.  Facial expressions shows whether there happy or sad, your tone shows if your serious or angry or excited, or your body show that as well more reserved people have their arm crossed, etc.  It helps a person survive because it shows them if the person is trying to deceive you if they are saying something and their emotions show something else.  It also helps you reproduce as well because it shows if the person is welcoming or not.


4.      There are definitely people out there who have a hard time reading body language.  One big example is guys and girls.  Guys tend to read girls smile as flirting and take it the wrong way, when probably a girl just has a friendly smile.  Or it can be where the girl is interested and maybe has her eyes down and looks to herself because she is shy.  

Tuesday, May 12, 2015

Piltdown Hoax


Piltdown Hoax was pieces of bone fragments that were found and was said o be fossilized remains of early unknown humans.  The town called Louis in Southern England there was a man named Charles Dawson who started this whole hoax many years after a worker found a piece of skull in the Piltdown gravel pit and Dawson and a man named Arthur Woodward continued to dig up different bone fragments.  They said that the skull had ape like jawbone and human teeth.  This lead researchers in the wrong direction for many decades until the truth came out in 1970; the hoax was discovered when a trunk was found that contained fossils that were modified and looked similar to that of the Piltdown finding.  The belief was that the larger modern day human brain evolved prior to the evolution of out omnivorous teeth.  Dawson findings were found to be in fact forged.

The human faults are that their greedy, prideful and lack of knowledge on the subject; just before this, Germany made a claim of humans originating from Germany, the hoax was then started in England to draw peoples attention for years.  The British wanted the attention and another part of the reason why the hoax was accepted for so long was the scientists had an improper understanding of evolution and how it occurred.

What exposed this hoax was other findings throughout the world and none of these findings would ever match that of Dawson's findings.  Many tests were done on the fossils during the mid-1900, one of these tests was a fluorine test, which showed that the fossils were no more than 100 years old.  After their testings they were able to conclude that the fossils indeed came from two different creatures, which was human and of an ape.   They were able to see that bones were staged different colors and looking at the teeth under the microscope showed scratches that imply that the teeth had been filed down to change their shape so it looks more human in appearance.

I think to a certain extent it is possible to remove the human factor from science, but as humans we are always looking for the answers.  It is human nature to find those answers when possible.  I do not think it is possible to completely remove the human factor from science.  However, we can definitely lessen it and learn from it.  I believe that by properly following the scientific method that you can limit the amount of hoaxes that are accepted as the "truth".

I learned that this shows how important it is to think critically and not to believe someone because they have a title or seem important or even seem to know what they are talking about.  We need to use our own minds and to know what sounds reasonable to us and use common sense.  I try to imply this in many aspects of my life.


Wednesday, May 6, 2015

Primates



 Sifaka (Prosimians/Strepsirhini representative) –
A. Sifakas are in the Madagascar forests, which is an island country in the Indian Ocean and they spend most of their time in the trees. They can be found in many habitats from rainforest to western and dry and spiny forests. Sifakas are threatened by the destruction of their forest habitats and some species are hunted for meat, though others are protected by Malagasy tradition that forbids eating their flesh. They are almost all classified as rare, vulnerable, or endangered. At least 17 species of Sifakas have become extinct since man arrived on Madagascar.  
B. These primates has a long tail that it uses as a balance when leaping from tree to tree. These primates remain upright, and they leap quickly from tree to tree by jumping with their strong hind legs.  They clear distances of over 30 feet and can also move quickly on the ground, which they do using a two-legged sideways hop and its body is so highly adapted to an arboreal existence that on the ground its only means of locomotion is hopping. They use their arms and legs to grip tree branches unlike other primates who use there tail.


C.  Sifakas environment have influenced their locomotors adaptation.  Their tails have adapted to give balance as they go thru the rain-forests instead of being used as an extra limb like their close primate relatives. And they are usually traveling the treetops quickly, their arms and legs have adapted to the swift movements.  

Spider Monkey (New World Monkey/Platyrrhini representative) –    
   
A. Spider monkeys live in the tropical rain forests of Central and South America and occur as far north as Mexico.  Because their large size, spider monkeys require large tracts of moist evergreen forests, and prefer undisturbed primary rain forest and they are social animals and live in bands of up to 35 individuals but will split up to forage during the day. They find food in the treetops and eat nuts, fruits, leaves, bird eggs, and spiders. Indigenous peoples often hunt spider monkeys for food, and the animals are usually agitated by human contact. Logging and deforestation continue to shrink the space that spider monkeys are able to call home.

B.  Spider monkeys locomotor pattern is using all five's: the arms, legs and their tail.  Spider monkeys have long, lanky arms and gripping tails that enable them to move gracefully from branch to branch and tree to tree and these monkeys spend most of their time aloft, and maintain a grip on branches even though they have no thumbs.  These primates are loud animals and often communicate with many calls, screeches, barks, and other sounds.

C. Spider monkey's environment is influenced by their locomotors adaptation. Their gripping tails are useful adaptation for eating, hanging from their tails allows them to gather food with both hands.  Also they are able to grip with their fingers and thumbs allow them to get out of danger by shaking the branches to scare away prey.




Olive Baboon (Old World Monkey/Cercopithecidae representative)-

A. Olive Baboons are found in 25 countries through Africa, Mali, Ethiopia.  Its inhabits are steppes, Savannah and forests. A. They eat fruits, grasses, roots seeds, small birds and rodents. They act as pests for some farmers because they attack their livestock such as sheep and also eat their crops.  They need to be where there is a water sources and safe sleeping places in either tall trees or on cliffs. Baboons drink every day or two, but they can survive for long periods by licking the night dew from their fur.  The baboon's major predators are humans; the males may confront other predators like leopards or cheetahs by forming a line and strutting in a threatening manner while baring their large canines and screaming.

B. Baboon’s locomotors pattern is walking quadrupedally, meaning on all fours and they are semi-terrestrial.   They stay on the ground during the day but also climb trees to sleep at night. Baboons do not have gripping tails like other primates.

C. Baboon’s environment plays an important part in their locomotors.  The baboon doesn't have a gripping tail to use as an extra limb. The limb-like tails are primarily used for grasping branches to move from treetop to treetop. The baboon, on the other hand, stays on ground sitting upon rocks as well as sitting or sleeping on rough branches in trees.


Lars Gibbon (Lesser ape/Hylobatidae representative)- 

 A. Gibbons are primarily found in the tropical and subtropical rain-forests of the South, East and Southeast Asia.  Lar gibbon are usually found in lowland, hill dipterocarp forest, and upper dipterocarp and sub montane rainforest, mixed deciduous bamboo forest, and seasonal evergreen forest. They are not usually found higher than 1200 meters above sea level. A. Gibbons are omnivores and eat flowers, fruits, leaves, insects, spiders, bird eggs and small birds. Gibbons spend most of their lives in trees, and because of their great skill of mobility in the dense treetops, most predators cannot catch them.

B. Their locomotion can move gibbons through the jungle at up to 35 miles an hour and can bridge gaps as wide as 50 feet with a single swinging leap. Brachiating also gives gibbons the unique advantage of being able to swing out and grab fruits growing at the end of branches, which limits competition for their favorite foods. When gibbons walk, whether along branches or in the rare instances when they descend to the ground, they often do so on two feet, throwing their arms above their head for balance.

    C. Gibbon’s environment influences its locomotors patterns. The dense forests of southern Asia, are perfectly adapted to life in the trees and rarely descend to the ground. They have strong, hook-shaped hands for grasping branches, comically outsize arms for reaching faraway limbs, and long, powerful legs for propelling and gasping. Their shoulder joints are even specially adapted to allow greater range of motion when swinging.


Chimpanzee (Great ape/Hominidae representative)-
A. Chimpanzees are currently found in 21 African countries—from the west coast of the continent to as far east as western Uganda, Rwanda, Burundi and Tanzania.   Chimpanzees live in communities found in African rainforests, grasslands, and woodlands. They are omnivores and they eat fruits, nuts, seeds, blossoms and leaves, but many kinds of insects and occasionally the meat of medium-sized mammals. Chimpanzee are intelligent and peaceful animals.

B. Chimpanzees move on all fours on the ground and in the trees and while walking, they tend to use their knuckles for support.  This form of locomotion is due to the fact that chimpanzees have longer arms than legs, so walk on the soles of their feet and on the knuckles of their hands.  They use their long, powerful arms to "brachiate" also known as swing from branch to branch and Chimps have both opposable thumbs and opposable big toes; which enable a precision grip on branches. Chimps are also capable of walking upright on two legs, like humans; but unlike humans, they usually only use this mode of locomotion if they need to travel while carrying objects in their hands.

C. The chimpanzees locomotion has been definitely affected by its environment. Whether they are walking in groups quadrupedal, or swinging from branch to branch, their locomotors ability is always adapting to their needs. These interchangeable traits are constantly at work to the chimpanzee’s advantage.

The environments makes a huge role in influencing physical and behavioral traits. All the primates share some similar qualities. But their environmental stresses causes them to physically look different from one another as well as behave differently from each other. Some primates have long arms and strong tails to brachiate and even eat at the same time. On the other hand, some primates lack these prehensile tails because it is not necessary where they live. The primates adapted how to walk, swing or jump all because of their differing environments. I believe that environments play a significant role in how organisms adapt their common physical and behavioral traits.









Thursday, April 30, 2015

Analogy & Homology

Bats and humans have homologous traits.  Bats and humans are vertebrates and both have skeletons and its traits are passed generation to generation.  Humans front limb bones are homologous to the bones of a bats front limbs; both of their front limbs in five and the parts are different sizes and they look similar.



            



Analogy is something comparable and similar but no relation to each other.  For example, animals with wings like birds, insects, bats, etc. are considered to be analogy.  Insects and birds have wings.  Insects have boneless wings and birds have bones.  Some insects have scale wings and birds usually have feathers on it.  They are different species but share a trait and that is wings and they fly with them, so therefore there environment is the same.  The trait wings itself is an analogy.

              

Thursday, April 16, 2015

Historical Influences on Darwin

Charles Darwin was an evolution scientist who is famous for his theory. His influences were from people like Linnaeus and his classification system. Also Lamarck, he was known for his Theory of Inheritance of Acquired Characteristic, Lamarck ideas were similar to Darwin and was the first to come out with this theory. Lamarck believed was more complex that organisms are not altered by their environment, and that a change in the environment causes changes in the needs of organisms living in that environment, which in turn causes changes in their behavior. The altered behavior leads to greater use of a given structure or organ and use would cause the structure to increase in size over several generations, where the disuse would cause it to disappear. Also the result of these laws was the continuous, gradual change of all organisms, as they became adapted to their environments; the physiological needs of organisms, created by their interactions with the environment. This was Lamarck evolution theory. Now this is Similar to Darwin’s because it had the same concept which is adaptive change in ancestry, ultimately driven by environmental change, over long periods of time.




Monday, April 6, 2015

Desert Island

If I was stranded on a deserted island and I can only take two items with me one of the items would definitely be a cell phone because I can hopefully get signal and call or text also you can play games and etc.  The second one would be a boat so I can leave the island.