Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
17 Cards in this Set
- Front
- Back
|
Allopatric speciation |
Occurs when two populations become geographically isolated (and therefor reproductively isolated.) Isolation can lead to speciation |
|
|
Allopatric species |
Two closely related species geographically isolated from each other |
|
|
Allopolyploidy |
The process where two different species produce an infertile hybrid. |
|
|
Autopolyploidy |
Homologous chromosomes do not seperate during meiosis, leading to diploid numbers of chromosomes present in the gametes |
|
|
Behavioural isolation |
Different courtship rituals (dances, vocalisations, etc) may lead to failure to recognise a mate for reproductive purposes |
|
|
Cline |
A pattern of gradual variation between individuals over a geographical area, usually due to differing selection pressures of the environments |
|
|
Deme |
A subset of a population where there is limited gene flow with members of a larger population |
|
|
Geographic isolation |
Species are located in separate ares and there is no geographic overlap |
|
|
Hybridisation |
The Process of creating offspring from two different species |
|
|
Postzygotic isolating mechanism |
Isolating mechanism that occurs after the zygote has formed |
|
|
Prezygotic isolating mechanism |
Isolating mechanism that prevents successful reproduction taking place |
|
|
Speciation |
The formation of a new species from an existing species |
|
|
Species |
A group of organisms that interbreed under natural conditions and are reproductively isolated from other species |
|
|
Subspecies |
A taxonomic rank below species. Subspecies cannot be seperated from the species group as successful interbreeding cannot take place |
|
|
Sympatric speciation |
The origin of a new species without geographical isolation from the ancestral species |
|
|
Sympatric species |
Species that have previously diverged from a common ancestor, now existing in the same are but continuing to remain reproductively isolated |
|
|
Temporal isolation |
Temporal isolation occurs due to timing differences between two species in the same geographical area |
