Work in group of two or three
Please provide definition of Speciation and extinctions. Also, find out an example for each concept from available information resources.
Please write down the names of the group while you are putting comments.
Tuesday, September 21, 2010
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Jordan Potter and Jessica Hartline
ReplyDelete>Speciation is the evolutionary process by which new biological species arise.
One example of natural speciation is the diversity of the three-spined stickleback, a marine fish that, after the last ice age, has undergone speciation into new freshwater colonies in isolated lakes and streams.
>In biology and ecology, extinction is the end of an organism or group of taxa. The moment of extinction is generally considered to be the death of the last individual of that species (although the capacity to breed and recover may have been lost before this point).
The Dodo bird is an often-cited example of modern extinction.
Megan Chandler, Stephanie Dalton, Regina Countess
ReplyDeleteSpeciation - the evolutionary process by which new biological species arise. An example is the three-spined stickleback. A fish which after the last ice age has undergone speciation into new freshwater colonies in isolated lakes and streams.
Extinction - the end of an organism or group of taxa. The moment of extinction is generally considered to be the death of the last individual of that species. An example is the dodo bird which has been extinct since the mid to late 17th century. Their extinction came about because of human activity.
Elizabeth Stamey Brittney Franklin
ReplyDelete1. Speciation: the evoultion of biological species
examples: Darwin's Finches from the Galápagos islands.
2. extinctions:In biology and ecology, extinction is the end of an organism or group of taxa. The moment of extinction is generally considered to be the death of the last individual of that species.There are two types: extinction by omission and extinction by Noncontingent Reinforcement (NCR).
examples; ivory-billed woodpecker, great auk, dodo, Steller's sea cow, Caribbean monk seal, dinosaurs
Kayla locke and Lorraine Rudd
ReplyDeletespeciation: formation of two species from one species because of divergent natural selection in response to changes in environmental conditions usually takes thousands of years.
Example:Three-spined stickleback
extinction: complete disappearance of species from the earth. It happens when a species cannot adapt and successfully reproduce under new environmental conditions or when a species evolves into one or more new species.
Example: Dinosaurs
Mallory Spangler and Brittany Bowlin
ReplyDeleteSpeciation is the evolutionary process by which a new biological arise. Darwins finches would be an example because they have distinct morphologies associated with different food items.
Extinction is the end of an organism or group of taxa. examples are tasmanian "wolf," passenger pigeon, carolina parakeet, ivory-billed woodpecker.
Jeremy Norris, Derika Grosser, Jannie Jackson
ReplyDeleteSpeciation-----The evolutionary formation of new biological species, usually by the division of a single species into two or more genetically distinct ones.
ex. Genus Canus-wolves---domestic dogs, coyotes, raccoon
Extinctions--- is the end of an organism or group of taxa.
ex. English Wolf, Tazmanina Wolf
Tiffany, Cindy, and Kasey
ReplyDeleteSpeciation- the evolutionary development of a biological species as by geographical isolation of a group of individuals from the main stock. Example: formation of 5 new species of chiclid fishes which formed since they were isolated less than 4000 years ago from the parent stock, Lake Nagubago.
Extinction- no longer existing, mass extinction is the first one caused and is either directly or indirectly caused by humans
Example- the passenger pigeon and Carolina parakeet
speciation: The evolutionary formation of new biological species, usually by the division of a single species into two or more genetically distinct ones. An example would be dinosaurs or Darwin's Finches
ReplyDeleteextinction: the gradual process by which a group of related organisms dies out. An example would be Carolina parakeet,Round Island Boa,Passenger pigeon,Martinique lizard, and Quagga.