The first semester of General Biology: The cell, genetics and development (BI170) Instructors: Dr. Geoffrey Church Dr. Anita Fernandez
Announcements Pre-Health student meeting tomorrow night @ 7:30 pm, here. EMT course still open, starts tomorrow evening (Registrar) No Gen Bio class on Friday. Go to convocation
The Syllabus Your contract for the course (everything you can expect to have to do, and expect from the professors) You can find it at http://www.faculty.fairfield.edu/biology/gen_bio/lecture_170.html Print out a copy and keep it with your class materials! -let’s take a look
The Text Book Biological Science 3rd ed. By Scott Freeman Study aids are found online at MasteringBio.com
Managing Gen Bio with other courses/obligations
Bio, chem, calc, English, core
3 hours for every 1 hour in class for the sciences (2:1 for others)
What is covered? What isn’t? Skipping chapter 2 (chemistry of water and basic bonding etc.) -you’ll need to refresh on your own Chapter 1 Cell Theory, Natural Selection, Tree of Life, experimental design and hypothesis testing, “Doing Biology” Chapters 3, 4, 6, 7 (Skipping 5) First Exam is Sept. 22nd (that’s only three weeks!)
The UNIQUE contributions of Darwin and Wallace came from their explanation of HOW evolution occurs. They called this process “descent with modification” - later known as natural selection .
Theory of Natural Selection : Individuals in a population that possess more favorable, heritable traits produce more offspring than do individuals without those traits.
Two conditions must be met for natural selection to occur in a population: (1) individuals in a population must differ from one another for some heritable trait(s); and (2) individuals with certain heritable traits must survive and/or reproduce better than individuals with other traits (“fitness”).
… so, In natural selection , the population’s characteristics will change over time as the individuals with the favorable traits produce more offspring, and increase in frequency.
We can control evolution! - Artificial Selection
Linnaeus proposed a hierarchical system for classifying organisms. This was based on obvious features such as ability to move, ability to make own food, etc.
2-kingdoms at first
Using Molecules to Understand the Tree of Life!
Carl Woese and colleagues began comparing organisms at the level of ribosomal RNA (rRNA) , a molecule found in all organisms. They used this to understand the evolutionary relationships among organisms.