Wsu Biology 106 Exam 2 With 100% Correct Answers 2023

Founder Effect {Ans: Occurs when a few individuals become isolated from a larger population Causes changes in allele frequencies}reproductive barriers {Ans: serve to isolate the gene pools of species and prevent interbreeding}Why natural selection cannot fashion perfect organisms {Ans: Selection can only act on existing variations Evolution is limited by historical constraints Adaptations are often compromises Chance, natural selection, and the environment interact Environment changes over time}parapatric speciation {Ans: speciation pattern in which populations speciate while in contact along a common border}Radula {Ans: An organ covered with teeth that mollusks use to scrape food into their mouths}monophyletic group {Ans: group that consists of a single ancestral species and all its descendants and excludes any organisms that are not descended from that common ancestor}Plesiomorphy {Ans: An ancestral state if a characteristic ex. humans have teeth which evolved a long time ago}Coelum {Ans: the body cavity in metazoans, located between the intestinal canal and the body wall.}Tube feet {Ans: Extensions of an echinoderm's water vascular system that stick out from the body and function in movement and obtaining food.}Eudicots {Ans: Any plant with fruit multiple cotyledons Cross sectioned vascular bundles}Heterozygous {Ans: