BIOL 1020 Lecture Notes - Lecture 8: Zygote, Ecolo, Polyploid
Document Summary
Process by which one species splits into two or more lineages, which eventually become species. Involves evolution in a branching pattern, with many new species evolving from a single parent. Consists of changes in allele frequency in a population over time. Broad patterns of evolutionary changes above species level. A species as the smallest group of individuals that share a common ancestor, forming one branch on the tree of life. Emphasizes reproductive isolation via prezygotic and postzygotic barriers that separate gene pools. Species of measureable anatomical criteria (i. e. characterizes a species by body shape & other structural features) Views a species in terms of its ecological niche, the sum of how members of the species interact w/ the nonliving & living parts of their environment. Analogy: speciation is to extinction as birth is to death. An individual that has more than two chromosome sets that are all derive from a single species.
