Lab 1 Flashcards
Body tube
Is a tube containing a prism that passes light from the objective lens to the ocular lens
Compound light microscope
3 lens system
- condenser lens - the light from the light source on the specimen
- objective lens magnifies the image of the specimen
- ocular lens magnifies the image and inverts it for better vision
Course focus
raise and lower the stage to focus the optics on the specimen
Dichotomous key
Used to identify specimens of plants and animals
What is aseptic technique?
The practice of maintaining sterile environment while working in the lab.
What are the four mechanisms of evolution?
Mutation, Gene flow, genetic drift, and selection.
What is Allopatric speciation?
When a geographical barrier causes the divide of a population, and the development of two separate species.
What is Sympatric speciation?
the Creation of a new species due to reproductive barriers.
What is mutation?
The process of incorrect transcription of DNA sequences leading to changes in protein synthesis and potential for expression of new phenotype or phenotype.
what is natural selection?
The process of adaptation through selected traits that allow for greater reproductive success
What is gene flow?
(migration) The movement of individual between populations that affects the frequency of alleles within that population.
can add or remove allele.
What happens when the gene flow between populations is cut off and they become reproductive isolated?
Specation
What is genetic drift?
The process of changing allele frequency in a population through random occurring sampling effects.
happens more in small populations rather than larger ones.
What is parasimony?
the idea that the tress that has the fewest alterations is the correct one.
simplest answer is usually the correct one.
What is a clade?
A group that contains a common ancestor and all of its dependents
