BIO 370 Study Guide - Quiz Guide: Parapatric Speciation, Ring Species, Speciation
BIO370 Discussion – Speciation
1- What are the three main definitions of species? For each one:
- explain what they mean
- what are their advantages and limitations?
- Give real of fictive scenarios leading to each type of speciation.
Which species concept is referred to by default when the word ‘species’ is used?
• Biological: human if you reproduce; part of the species, based on similarities.
o Straightforward, easy.
o Doesn’t account for convergent evolution.
• Phylogenetic: part of the species if you’re derived from parents that are part of the
species.
• Phenetically: smallest monophyletic group we can label it.
2- Explain each speciation mechanism: Allopatric speciation, parapatric and sympatric. For
allopatric, specify the two different subcategories.
• Allopatric: divergent
o Dumbbell model (vicariance) and peripheral isolate model (dispersal and
colonization).
• Sympatric: convergent
• Parapatric: ring populations; two population that don’t interbreed with gene flow
occurring b/w neighboring populations but at the end of the ring populations cannot
interbreed.
3- What is a ring species?
-Defined above.
4- What is a progenitor-derivative species pair?
Which species of the pair has more recent apomorphies and which species is more similar to the
common ancestor? Which situations leads to that scenario?
Which type of speciation causes it ?
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