BIOL 101 SI 9/19/07
Define:
Genus:
Species:
What are the three “definitions” of species?
1.
2.
3.
_________________species is a group of individuals that are structurally similar.
_________________species is a group of potentially interbreeding individuals.
T or F All individuals must interbreed.
A species is a ________________ that maintains its integrity through space and time.
Speciation depends on ___________ ____________
Allopatry is where two groups ____________ occur in the same place
_____________ is where two groups do occur in the same place
What are the five pre-zygotic isolating mechanisms?
1.
2.
3.
4.
5.
Give an example of spatial and temporal isolating mechanisms.
Provide an example of behavioral isolating mechanisms.
What is an example of a mechanical isolating mechanism?
Give an example of a gametic isolating system
What are the two post-zygotic isolating mechanisms?
1.
2.
T or F Concerning hybrid inviability, many hybrids die either in the embryonic or the
juvenile stage.
What does hybrid sterility mean? Provide one example.
________________ between populations allow isolating mechanisms to finalize
speciation.
Sympatric Speciation:
- Speciation between populations living in the __________ area.
- Usually requires strong ____________ selection.
Disruptive selection favors
a) the average phenotype
b) the extreme phenotypes
Factors Promoting Sympatric Speciation
- ______________ choice and ___________ choice are each determined by one
gene.
- Genes for habitat choice and mating choice are ___________ linked.
- The best situation results in one gene affecting both __________ choice and
________ choice.
______________ is a process in which lineages split.
______________ shows the evolutionary relationships among organisms.
Taxonomy doesn’t always reflect _____________ history.
______________ is a group that all came from a single ancestor (class Aves)
______________is where descendents come from multiple ancestors (Protista)
______________leave out other descendants (reptilia)
______________:where grouping is based on phenotypic similarity and does not
distinguish the cause of similarities (convergence evolution or common descent)
Cladistics:
- emphasizes common ___________
- distinguishes between _____________ ancestry and similarity due to __________