Blog #4 -Describe the three types of selection: directional, stabilizing and disruptive

Directional selection: is a mode of natural selection in which a single phenotype is favored, causing the   allele frequency to continuously shift in one direction.

Stabilizing  selection: is a type of natural selection in which genetic diversity decreases as the population stabilizes on a particular trait value.

Disruptive selection: describes changes in population genetics in which extreme values for a trait are favored over intermediate values.

Blog #3 Microevolution

Microevolution is a change in gene frequency within a population. The three step processes is mutation,  gene flo, and genetic drift. Natural selectionis one way variation occurs. Another way is genetic basis of a phenotype becomes more common in a population. The last way is if adaption occur within a population.

Blog # 2 Why is fossil record hard to interpret?

Since Darwin the fossil record has been pushed back to between 2.3 and 3.5 billion years before the present.   Most of these Precambrian fossils are microscopic bacteria or microfossils. However, macroscopic fossils are now known from the late proterzoic. The ediacara dating from 575 million years ago contain early multicellular eukaryotes. The fossil record and the form of the basis of the science of biostrastratigraphy or the age of rocks based on the fossils they contain.

Why is evolution a theory and not a law?

Evolution is the change over time in the proportion of individual organisms differing in one or more inherited traits. Evolution happens when there is a variation of inherited traits within a population. I think that from this, Evolution is a theory because it is not guaranteed to happen such as laws happen all the time. Theories are predictions on what will happen and laws are what will happen. Evolution will not always happen it is more a prediction.

LAST BLOG OF THE SEMESTER

My favoriite activity/topic this year is my 6th period class which is baseball. It is my favorite because its the thing i love most in my life. My least favorite is most of my classes that I have a bad grade in. If i could change one thing it would be my grades i would change it by not missing assignments and doing better.

Dr. Joann Burkholder,

Dr. Joann Burkholder, Professor of Applied Aquatic Ecology, NC State University. Dr. Burkholder conducted ground-breaking research in the early 1990s which linked Pfiesteria to massive fish kills, nutrient pollution and human illness. Her findings resulted in hundreds of millions of dollars in water quality improvements and additional scientific research for the Neuse River and other coastal estuaries. Her amazing discovery was the topic of a NY Times best-selling novel “And the Waters Turned to Blood” by Rodney Barker. The numerous beach closings, bans on fishing, and the thousands of children at summer camps who were prevented from swimming in the Neuse River in the mid 1990s likely prevented mass illness and unnecessary public exposure to Pfiesteria’s dangerous neurotoxins.

Should we be able to choose the traits of our babies?

   In the movie Gattaca the parents were able to choose the traits of their children. Do i think that parents should be able to choose their kids traits? I don't think parents should be able to do that because it is not a normal process. I think that child birth should be natural and no science to change the traits of your child because it would be like literally making your son on a computer.