bio - quiz #1 Flashcards
fact
Truth about the natural world
hypothesis
Prediction about the behavior of matter..or..suggested explanation for for an event – which one can test
* “An idea you can test”
theory
Tested and confirmed explanation for observations or phenomena
Germ Theory, Evolution
law
Universally accepted as true – always applies - Gravity
the goal of science is to…
disprove!! good hypothesis is falsifiable
corona vaccine is example of…
applied science (not basic!!)
serendipity
finding something great while looking for something else
SCIENTIFIC LITERATURE:
- poplar literature 3 (internet, ideas)
- gray literature 3/2 (more on topic)
- white papers 2 (gov)
- peer reviewed 1 (other scientists)
evolution
change in gene frequencies in population or species over time
history + names: Darwin, e.
breed fast horses
history + names: Lyell
father modern geology, rocks + time period
history + names: Darwin, c
evolution, med school
history + names: Wallace
butterflies, natural selection
history + names: bates
lost in amazon, mimicry
history + names: Lamarck
didn’t catch on
natural selection
process by which some individuals survive and reproduce better than others
adaptation
trait or characteristic that when present, gives those with it an advantage to survive and reproduce (are inherited)
darwins 4- tenets of natural selection
1- traits are variable
2- traits are heritable
3- some individuals in a population survive better than others
4- some individuals in a population will reproduce more than others
adaptations help…
natural selection which leads to evolution
divergent evolution
related organisms become very different, from one point into separate lineages
convergent evolution
unrelated organisms independently evolve similar traits
- shark and dolphins “converge”
homologous structures
same overall layout despite modifications in lineages
- tetrapod forelimb
vestigial structures
structures in organisms with no apparent function, residual from ancestor
- tailbone
fossil record
fossils show evidence of past structures
molecular biology
DNA sequences
biogeography
distribution of organisms
misconceptions!!
- just a theory
- individuals evolve
- evolution explains origins of life
organisms evolve for a purpose
species
a group of individuals that can interbreed + produce fertile viable offspring
gene pool
collection of all the gene variants in a population/ species
hybrids
cross between two species, offspring may be infertile
speciation
formation of two (or more) species from an original species (not always a simple “Y”, depends on heritability)
allopatric speciation
geographic separation (varying pressure on new populations, reduced gene flow)
sympatric seperation
parent species existing together (polyploidy, niche petitioning, ie) birds beaks - breed @diff parts of tree - become two diff species)
dispersal
few members move to new location