Reading...
Play button
Play button
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;
18 Cards in this Set
- Front
- Back
|
Speciation
|
the process by which one speices spilts into tow or more species
|
|
|
microevolution
|
changes over time in allele frequencies in a population
|
|
|
macroevolution
|
the broead pattern of evolution over long time spans
|
|
|
biologoical species concept
|
a species is a group of population whose members have the potential to interbreed in nature and produce, viable, fertile offspring but not with other species.
|
|
|
reproductive isolation
|
the existance of biological factors that impede members of two species from producing viable, fertile offspring.
|
|
|
hybrids
|
offspring that result from an interspecific, mating
|
|
|
prezygotic barriers
|
block fertilization from occuring
|
|
|
postzygotic barriers
|
may contribute to reproduction isolation
|
|
|
morphological species concept
|
characterizes a species by body shape and other structural feature
|
|
|
ecological species concept
|
views a species in terms of it's niche, the sum of how members of the species interact with the nonliving and livinng parts of their enviroment
|
|
|
phylogenetic species concept
|
defines a species as the smallest group of indiviuals that share a common ancestor
|
|
|
allopatric speciation
|
gene flow is interrupted when a population is divided into geographically isolated subpopulations
|
|
|
sympatric speciation
|
speciation occurs in populations that live in the same geographic area
|
|
|
polyploidy
|
extra sets of chromosomes
|
|
|
autopolyploidy
|
is an individual that has more than two chromosome sets that are all derived from a species
|
|
|
allopolyploidy
|
are fertile when mating with each other but cannon interbreed with either parent species; thus they represent a new biological species.
|
|
|
hybrid zone
|
a region in which members of different species meet and mate, producing at least some offspring of mixed ancestry.
|
|
|
punctuated equilibria
|
periods of apparent stasis punctuated by sudden change
|
