Evolution (in Comp. Ana. context)
descent with modification looked at through lineages
original source of variation
change in gene frequencies resulting from random fluctuations
the migration & interbreeding of individuals between populations
...soooo...like when mating is not random...i.e. individuals mate with those of a similar phenotype.
process of genetic change in a population because of natural selection
long periods of no changes, punctuated by times of lots of speciation
long line of the cladogram showing no change
A pattern of evolutionary change involving the transformation of an entire population (online definition)
giving rise to a new species...perhaps...?
in this context; a lineage of organisms, connected through time by ancestor-descendant relationships...
A study that seeks to discover the evolutionary history of a group and thus construct its classification scheme...
...gather data a number of characters in terms of morphology, physiology, behavior, genetics...etc...
group of species that includes an ancestor and all of its descendants...i.e; clade.
an unnatural taxon due to the common ancestor being place outside the group
unnatural taxon due to the failure to include all descendants.
a monophyletic lineage that is most closely related to the lineage of study
traits that can be traced back to a trait in the most common ancestor. Ex; whale, frog, horse, lion, human and bat forelimbs
traits that have evolved independently, even though they have superficial resemblance in function and morphology (online definition)
traits that just appear similar
a homologous similarity that unites monophyletic groups
similarity inherited from the most recent common ancestor
similarity that arose prior to the common ancestor of the group
using shared, derived characteristics to determine relationships among taxa.
*Used to assign character polarity
* Related to (but not part of) the group under study