Evolution Of Animal Diversity Flashcards
Evidence of former life
Fossils
First hypothesis for evolution (transformational)
Lamarckism
The assumption that the same natural laws and processes that operate in our present day scientific observations have always operated in the universe in the past and apply eberywhere in the universe
Geng geng
Uniformitarianism
The living world is neither constant nor perpetually cycling, but always changing
Perpetual change
Multiple species derive from a single ancestral population
Common Descent
Genetic variation within a species, especially variations that occurs between geographically separated populations, provides the material from which new species are produced
Multiplication of species
Large morphological changes in organisms occur via a number of smaller steps over a number of years
Gradualism
The oricess through which populations of living organisms adapt and change
Natural selection
Some individuals have traits better suited to the environment than others
Natural selection
The Biogenetic Law
Ontogeny recapitulates phylogeny
Heirarchal Organization of Animal Complexity
- Protoplasmic level
- Cellular level
- Cell-Tissue level
- Tissue-Organ level
- Organ-System level
Characterizes unicellular organisms
Protoplasmic level
Denotes an aggregation of undifferentiated cells
Colonial organization
Denotes an aggregation of cells that are functionally differentiated
Multicellular organization
Similar cells aggregate into definite patterns or layers becoming a tissue, a group of cells organized to perform a common function
Cell-Tissue level
Contains more than one kind of tisse and have a more specialized function than tissues
Tissue-Organ level
Organs work together to perform some function, they form a more comolex level of organization
Organ-System level
Refers to balanced proportions and chape of parts on opposite sides of a median plane
Body symmetry
Forms with no clear symmetry
Asymmetrical
Applies to forms that can be divided into equal halbes by more than two planes passing through a longitudinal axis
Radial
Exhibits correspondence or rehularity of parts around a central axis
Radial symmetry
Endless but finite, number of symmetry axes throug the body
Spherical symmetry
Embryonic tissues formed during gastrulation and gives rise to different layers such as skin, muscles, organ system
Germ layer
