Chapter 2- Concepts, Premises, & Pioneers Flashcards
Who?
Belief:
Humans and birds were similar
Similarities were a manifestation of a divine architectural plan of the Creator
Pierre Belon
2 factors/methods of Organic Evolution
Common Ancestry
Adaptive Modifications
refers to coincidental resemblance
analogy
similarities between structures that cannot be explained by homology
Homoplasy
applied to traits that have enabled a phenotype to meet new environmental challenge before it materializes
Preadaptation
Formation of new species is preceded in almost every instance, if not invariably, by geographical isolation if a population from other populations of the same species
or
emergence of new species from preexisting ones
Speciation
Geographical isolation + ________ ➡️ matrix out of which new species evolve
genetic change
When two or more unrelated organism occupy similar environments,whether concurrently or millions of years apart, and acquire similar morphological features as adaptations to that environment
Evolutionary Convergence
Development history of an organism
Ontogeny
The evolutionary history of a taxon
Phylogeny
Features common to all members of a major taxonomic group of animals develop earlier in ontogeny than do features that distinguish subdivisions of the group
(law)
Von Baer’s Law
Features that develop earliest in ontogeng are the oldest phylogenetically, having brrn inherited from early common ancestors
Corollary