Readings 13 notes

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University of Toronto Scarborough
Biological Sciences
Maydianne Andrade

Readings 13 Pgs. 605-633 (refer to Figure 16.7) -a species is the smallest evolutionary independent unit -evolutionary independence occurs when mutation, selection, gene flow, and drift operate on populations separately -speciation is caused by lack of gene flow -there are three important species concepts, which all agree that species are evolutionary independent units that are isolated by lack of gene flow -each concept employs a different criterion for determining that independence is in effect -the morphospecies concept involves people naming species based on morphological similarities and differences (widely applicable concept) -morphospecies can be identified in species that are extinct or living and in species that reproduce sexually or asexually -the disadvantage of the morphospecies concept is that when it is not applied carefully, species definitions can be arbitrary -cryptic species }o]}LZZZZo]K]L ZL Z}ZZ L[ be distinguished -cryptic species are considered the same based on morphological similarity -under the biological species concept, the criterion for identifying evolutionary independence is reproductive isolation -the advantage of the BSC is that reproductive isolation confirms the lack of gene flow in speciation -Z]ZL2}Z ^ ]ZZ]]ZZ}o ZL}o]}LZZ}L[
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