BIOL2712 Study Guide - Final Guide: Resistance 2, Drug Resistance, Mesozoa
25 Jun 2018
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Animal Diversity
What is Science?
Characteristics:
oGuided by natural law
oHas to be explanatory with reference to natural law
oTestable against the natural world
oIts conclusions are tentative – not necessarily the final word
oIt is falsifiable
After many decades of testing:
oThe theory of evolution by natural selection has not been falsified, but rather
gains increasing support
What is an Animal?
Heterotrophic
oOrganism depends upon other organisms to survive, cannot synthesize its
own food
oPlants and animals
Eukaryotic
oWell-defined cells with nuclei and cell ways
Multicellular
oNo structural cell walls
oHeld together by proteins, particularly collagen
Most reproduce sexually
oFertilized egg forms a diploid zygote
Cells from each parent that combine to form the zygote = gametes
Male gamete = sperm
Female gamete = egg
oUndergoes cleavage to form a multicellular blastula
Differentiation of cell types and tissues
oIncludes muscles and nerves for movement and impulse conduction
Note: there are exceptions to every rule
Animal Diversity (Metazoa)
Total number of species – vary from 10-20 million up to 100-200 million
1.3 million living species currently identified
o31 phyla; 3 branches
Parazoa, Mesozoa, Eumetazoe (2 divsions)
oMost are invertebrates
find more resources at oneclass.com
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Document Summary
Characteristics: guided by natural law, has to be explanatory with reference to natural law, testable against the natural world, its conclusions are tentative not necessarily the final word, it is falsifiable. After many decades of testing: the theory of evolution by natural selection has not been falsified, but rather gains increasing support. Heterotrophic: organism depends upon other organisms to survive, cannot synthesize its own food, plants and animals. Eukaryotic: well-defined cells with nuclei and cell ways. Multicellular: no structural cell walls, held together by proteins, particularly collagen. Most reproduce sexually: fertilized egg forms a diploid zygote. Cells from each parent that combine to form the zygote = gametes. Female gamete = egg: undergoes cleavage to form a multicellular blastula. Differentiation of cell types and tissues: includes muscles and nerves for movement and impulse conduction. Note: there are exceptions to every rule. Total number of species vary from 10-20 million up to 100-200 million.
