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Introduction to Natural Selection Natural selection posits that only a certain percentage of offspring born will survive to reproduce another generation. Individuals with certain genotypes will be more likely to survive, mate, and reproduce their genotypes in subsequent generations. Thus, natural selection acts upon individuals, whereas evolution occurs at the level of a population. There are [...] Altering Existing Genetic Variation Genetic drift is a change in in genetic variation due to chance changes in allele frequencies. For example, genetic drift may occur as a matter of luck; one phenotype may simply never meet a member of the opposite sex in order to mate and produce offspring. Genetic drift is not affected [...] Population geneticists primarily study allele and genotype frequencies. They use quantitative methods to analyze the frequency of alleles. For example, a population geneticist may study the frequency of certain patterns on the fur of wild cats, then will revisit the same population several generations later to find how the frequency of patterns has changed from [...] Species- a natural group that shares a distinct form NASA – NASA’s Kepler Space Telescope Discovers its First Five Exoplanets . If the Kepler spacecraft could discover 5 new planets after just 6 weeks on the job, imagine what else it may find during its tenure until 2012! Onset & Symptoms: Personality changes Treatments: Nothing known to slow or stop the decline Prevalence: 1 in 20,000 people Famous People with the Disease: Woody Guthrie Heritability & Environmental Factors: Caused by a dominant allele Individuals with Huntington’s Disease have one dominant Huntington’s allele and one normal allele. It is [...] Onset & Symtoms: Mental retardation Treatments: Specialized low-phenylalanine diet Prevalence: 1 in 10,000 people Famous People with the Disease: Unknown Heritability & Environmental Factors: Caused by a recessive allele PKU is caused by a recessive allele, meaning an individual must inherit two copies of the allele, one from each parent, in order [...] Ribosomes are the location where translation takes place. Prokaryotic cells do not have compartmentalized organelles, and thus need only one type of ribosome. They have one type of ribosome that translates the mRNA in the cytoplasm. In eukaryotic cells, however, there are different kinds of ribosomes in different organelles. The most abundant type of ribosome [...]
Article being discussed: Disinfectants may promote growth of superbugs. At first blush, it seems this article may be telling us a couple things we already know. Most people are aware of the superbug concept- that bacteria can become resistant to things that are supposed to kill them, because of the overuse of things [...] This research sheds a whole new light on the autism spectrum disorder. Hopefully, we will be able to gain a broader understanding and appreciation for the inner life of a person with autism, and be able to help them. How the autistic brain distinguishes oneself from others. |
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