Term
|
Definition
1) Non-random mating
2) Natural Selection
3) Genetic drift (due to random separation of minor part of population, colonizations eg. )
4) Gene flow
5) mutation |
|
|
Term
| Darwins Evidence and Inferences for this Argument |
|
Definition
#1 Observation: members of a population often vary in their inherited traits
#1 Inference: Individuals with good inherited traits have a higher probability of surviving, thus reproducing and leaving more offspring
#2 Observation: All species can produce more offspring than their environment can support and many die young
#2 Inference: :This unequal ability to survive because of limited resources means only the desirable traits accumulate |
|
|
Term
|
Definition
1) Barrier
- geographic
- temporal
- courtship display
2) Population divergence
- any cause of evolution, e.g.
natural catastrophe, winds
3) Sexual Incompatibility
- no fertile offspring, meiosis fail e.g. recombination/reshuffling |
|
|
Term
|
Definition
| steady accumulation of small changes over time |
|
|
Term
|
Definition
| periods of stasis punctuated with sudden change (mutation, gene expressed) |
|
|
Term
|
Definition
| geographic isolation leads to new species |
|
|
Term
|
Definition
non-geographic factors lead to new species e.g. reproduction facots
1) autopolyploidy : cell division error, tetraploid cannot reproduce with parent species but with self
2) allopolyploid : infertile hybrid may propagate itself asexually |
|
|
Term
| Where does genetic variation stem from? |
|
Definition
1) Mutations (copying error, environment)
2) Sexual Reproduction (recombination, reshuffling of chromosomes) |
|
|
Term
|
Definition
1) Directional - preferred trait for reproduction
2) Disruptive - favors 2 extremes
3) Frequency-dependent : favors the intermediate
Regardless, selection favors individuals whose heritable phenotypic traits provide higher reproductive success |
|
|
