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14 Cards in this Set

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  • Back

Morphological species concept

Call species different because they look different

Biological species concept

Groups of actually/potentially interbreeding natural populations which are reproductively isolated from such other groups

Phylogenetic species concept

Group of populations evolved together with diagnostic features

Ecological species concept

Used with similar asexual organisms that occupy different niches

Briefly describe how a prezygotic reproductive isolating mechanism differs from a postzygotic reproductive isolating mechanism

Pre zygotic:






Post zygotic:

Hybrid Inviability

Hybrid Sterility

Some populations of organisms do not interbreed because reproduction takes place at different times of the day, season, or year.


Organisms do not interbreed because they do not recognize each other’smating displays.


Two individuals mate and produce offspring, but the offspring are sterile

Hybrid Sterility

Which type of speciation occurs when one population becomes geographically separated from the rest of the populations of the species, and subsequently evolves (by natural selection and/or genetic drift) to the point where a barrier to reproduction is produced?


How does the taxonomic hierarchy accommodate (or recognize) populations that are distinctively different from other populations of the same species, but are not yet reproductively isolated from those other populations?


Speciation through ploidy changes is an example of:


Which form of polyploidy results from the following two steps?

1) hybridization between two similar species of plants (resulting hybrids may be sterile)

2) doubling of the number of chromosomes (e.g. by nondisjunction)

Sympatric Speciation

Which form of polyploidy results from the doubling of the number of chromosomes (without hybridization) resulting (for example) in tetraploid individuals


What would you predict would happen if an autopolyploid and its diploid ancestor had exactly the same niche preferences?

Genetically Identical- One will go extinct