Sunday, May 9, 2010
Speciation
Choose an organism (everyone must choose a different organism- repeat organisms will receive no credit!). Explain a scenario in which a population of this species could become geographically isolated leading to the eventual formation of 2 genetically different subspecies (review finch example given in class Thurs 5/6, but don't use it as your answer!). Be creative here!!!! Please include your name at the end of your response.
Subscribe to:
Post Comments (Atom)
21 comments:
In the case of lemurs, it was geographical isolation which allowed them to evolve, because when Madagascar broke off from mainland Africa the lemurs' ancestors would've been split into 2 groups (the animals living on the mainland and the animals living on Madagascar) which were then unable to interbreed- millions of years of evolution then resulted in the 2 groups becoming seperate species as each adapted to their particular environment.
Geographic isolation caused the evolution of elephants because the differed environments on earth changed drastically around 50-60 million years ago. Now we have two different kinds of elephants, the Asian and the African elephant. They both have different attributes that help them to survive in their different environments.
Megan Corey
Geographical isolation caused the evolution of the moose. The present-day moose is evolved from a primitive version from Asia. This moose lived during the Pleistocene, or until 2 million years ago, and walked to North America across the ice bridge that was between Alaska and Asia during the Ice Age. Now, there are subspecies of moose which still live in Asia, as well as Europe and four subspecies that live in North America. The Eastern Moose, lives in eastern Canada and New England. The Northwestern Moose, can be found in northern Michigan, Minnesota, western Ontario, central British Columbia and eastern parts of the Yukon. The Shiras Moose, lives in Wyoming, Montana, northern and eastern Idaho, southeastern British Columbia, northern Utah and the Colorado Rockies. The Alaskan Moose, the largest subspecies of moose, is found in the western parts of the Yukon, northwestern British Columbia and Alaska. These moose all have adaptations to better survive in their new environments.
Brooke Singer
The in new jersey squirrels could become geographicly isolated if a part of the new jersey coast line splits away from the rest and take some squirrels wich can cause isolation
One example of natural speciation is the diversity of the three-spined stickleback after the last ice age, has gone speciation into new freshwater colonies in isolated lakes and streams. Changes in the number or size of their bony plates, variable jaw structure, and color differences.
Christian Hall
Tigers have become geologically isolated. Bengal tigers are adapted to the hot climate of India. While Siberian tigers are found in the cold climate of Siberia. Through isolation the species of Tiger has changed while the animals adapt to their different environments.
Different types of mice have been geographis isolated because of there hair color. One type of mouses hair color is dark brown so their preditors cant see them to hunt them. Another type of mouse has lighter hair color so that they can stay safe from there preditors too. Both of these mice live in very different places and that is why they look so different.
Geographic isolation caused the evolution of different kinds of moths. Some have to be adapted to its environment and blend in with its surrounding like its darker color to match a dark tree.
georgraphical isolation of different rabbits by their colors. White rabbits are seen commonly in areas tha recieve a lot of snow, while brown rabbits are seen in areas that have a lot of forests.
kara ganley.
If the entire human population of russia was transported to jupiter they would have to adapt to their surroundings and they eventually would become a new species with new adaptations
Matthew Ferguson
sharks: theyre are many different types of sharks adapted to the different types of temperatures of the surrounding waters. they also had to adapt to the different water depths.these adaptations such as color, shape or structure help them survive.
Austin Belmont
A group of Polar bears are isolated from the original population because the ice melted. Only the bears that have webbed feet and that are capable of holding their breathe the longest survived and made it to a tropical island. The ones that survive managed to reproduce. Over time, the bears adapted to the new climate by having less and less fur. Soon, the polar bears become hairless and can no longer reproduce with the original population.
Geographic evolution caused the isolaiton of certain breeds of dogs. The are tamed dogs, which are for pets and gaurd dogs. Another type of dog is Husky. Huksies are used in very very cold temperatures so pull people around on sleds. If any other type of dog, like a poodle or cockapoo were to live in the extreme cold, it might not survive because it hasnt gotten adapted.
Carly Greer.
Different species of birds have been created from certain geological isolation cases. Birds all came from the same place to begin with. but for example, seaguls and the bald eagle are completely different species. The seaguls genetics changed from their adaptation to more of a ground level type of living. More on the shore and close to the ground caused their type of wing feather to change because since they dont have to get as high up, they dont need such thick feathers. Also the fact it is usually warm near the shore there is no need for a winter coat. where as bald eagles are the type of bird who have very high elevation for nesting and what not, therefore they need a thicker coat of feathers to fly higher and adjust to the winds and temperature change up so high.
erica vignola
georgraphical isolation of different cats by their colors. Black cats are more commonly seen in areas like streets or woods, or maybe even houses. While brown cats or whitee are seen as house pets or outsidee cats.
Alexa Bertolini
When it comes to humans, we were geographically separated (into our different continents) which caused u to adapt to the climate. (ex: in Africa the people have darker skin to help protect them from getting burned by the sun. The Irish have really light skin because they don't need as much protection from the sun.)
Monkeys could be geographically isolated if alll the trees fell in africa.Then monkeys will have find different food instead of bananas like meat of other animals, this means they will have to change their diet in extreme ways. they'll have to get sharper teeth to hunt and eat.
Andrew McCormick
Geographical isolation caused evolution in Yellowthroat Geothlypis Trichas in the united states. There is actually seven sub species made out of the Yellowthroat Geothlypis Trichas and unless they breed together they will always be in totally different environments.
If a population of frogs were geographically isolated to the continent of Antarctica in a large hurricane that swept across the entire Earth then they would change genetically. They would grow another layer of skin and an some hair. This would protect them from the cold. They would be a different subspecies than that of the original frog.
A species of anteaters was genectically isolate when they force to a different area because of predators. These anteaters could evolve to have a different type of snout if the ant's habitat is different. This would make a whole new sub species of anteaters.
Post a Comment