ch 16 Flashcards
definition of species according to morphological species concept
group of individuals that look alike
emphasis of the morphological species concepts i recognizing species
visual recognition
cryptic species
species that are morphologically indistinguishable but dont interbreed
reproductive isolation
state where two groups of organisms can no longer exchange genes
what defines species (biological species)
group of actually or potentially interbreeding natural populations that are reproductively isolated from other groups
lineage species concept’s definition of a species
branch on the tree of life with a history that starts at a speciation and ends at extinction
what is the model for how one reproductively cohesive lineage splits into two reproductively isolated species
isolated lineages accumulate allele differences leading to genetic incompatibility and reproductive isolation
allopatric speciation
population division by physical barrier
sympatric speciation, how does it differ from allopatric speciation
speciation due to reproductive isolation without physical separation
prezygotic isolating mechanisms
prevents hybridization before union of gametes, acts before fertilization and prevents mating
classification of organisms based on appearance alone is known as the ____ species concept
morphological
a butterfly species is separating into two different groups.- one lays eggs in the understory of bushes and other top of bushes. This butterfly is experiencing:
sympatric speciation by disruptive selection; bc same location and both extremes are favored
Sperm of species A dies when it comes in contact with female reproductive tract of species B. Example of
prezygotic isolating mechanisms
how do allopatric and sympatric speciation differ
allopatric involves physical separation of groups as they form new species, sympatric speciation dos not.
