Lindsey Erwin's General Biology Blog
Friday, May 4, 2012
Evolution #10
Evolution is the process of growth or development. There is also two different types of evolution, microevolution and macroevolution. Microevolution has to do with the changes within a species. Macroevolution is when a species changes into another species. There are many reasons to support evolution but there are many reasons to say that evolution never did happen. I believe that it didn't occur ever. There are so many gaps in the fossil findings and so many questions it makes it hard to believe. There are also different people saying different things and not agreeing which makes it hard to think its real. I do not believe that we evolved from apes and I think that is all crazy talk.
Thursday, May 3, 2012
Evolution #9
A cladogram shows evolutionary relationships based on physical features. Many of the cladograms show that humans branch off from chimps and the closest ancestors are the Australopeticenes and the homo erectus and the cro. mag. According to our cladogram features that seemed more apelike was bipedilism, flat foreheads, and canine diastema. Some say that we have been evolving in the past 200,000 years and some say we have not been evolving. Personally I do not think we have been evolving but there are many reasons to support both sides.
Wednesday, April 25, 2012
Evolution #8
The DNA sequences between humans, gorillas, and chimps are similar. Humans and chimps DNA sequences match the closest, the gorilla still had some matches but not quite as many. We could have also looked at similarities in looks and behaviors and also look at the whole genome to see which we are closest to. Chimps and humans have a common ancestor is a pretty accurate statement. We have similarities in our DNA with chimps but are clearly different than chimps. Therefore chimps are not the direct ancestors of humans.
Sunday, April 22, 2012
Evolution #7
They looked at the relative size and number of the molars in mice. They concluded with molars emerge from the front backwards, with each tooth smaller than the last. The work shows how the pattern of gene expression can be modified during evolution to produce adaptive changes in natural systems.
Thursday, April 19, 2012
Evolution #6
Mutation is also involved in evolution. There is a specific example of how it shows for natural selection. The example of the malaria and sickle cell anemia shows this example fully. HbS carriers have been naturally selected because it has some resistance to malaria. Genetic diversity is really important because if we all have the same genes than one disease could take us all out. Since we are not all the same different diseases affect us all differently.
Wednesday, April 18, 2012
Evolution #5
Natural selection plays a big part in the theory of evolution. The animals with the more desirable traits will probably survive more and produce more offspring like themselves. The dominant alleoles will overrule the recessesive alleole. They will eventually die out like we did in our bunny lab. Environment and weather plays a role during this as well. Fish also have different traits which have good and bad reasons to it. Colorful fish will be easily seen but will attract more mates and the opposite is true for drab fish.
Thursday, April 12, 2012
Evolution #4
Evolutionist believe that everything comes from ancestors from a long time ago. There was an evolutionary progression in the Cambrian Period and ancestors were found in it. There was also a big finding in the Burgess Shale which showed not just the hard parts of animals bodies but also the muscles, gills, digestive system which was the first to show features of species today. This ties in with the first thing I said but I do not think it is enough information to conclude that we came from different ancestors like chimps and gorillas.
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