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Biodiversity Animal Exam1

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Terms

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gastrulation
cell fate: bastula makes first germ layer and becomes gastula
choanoflagellates
protist group that is closest related to animals
metazoans
appear 550mya
anatomical homology example
same bones in lims of bats and cats
clevage
cell division, not growth. produces multicellular bastula
developmental homology example
human embryos have gills indicating aquatic ancestor
multicellular eukaryotes
appeared 1.5bya
organoogenesis
body organs form
developmental homology
species that differ as adults often bear striking similarities during embryonic stages
genetic drift
occurs in small populations, can occur in one generation
disruptive selection
favors survival of 2 or more different genotypes
protists
dont fall under single group, some are close to animals and some distant
anatomical homology
homologous structures are derived from a common ancestor
trace evidence
not direct evidence... ex. a footprint
molecular homology
similar cells at molecular level indicate evolution from a common ancestor or interrelated group of common ancestors
uniformitarism
theory states geological processes that happen today are the same as past
directional selection
selection favors eaither low or high extremes
stableizing selection
favors intermediate phenotypes, extrems are selected against

Deck Info

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