BIO202 Chapter 24

Macroevolution

evolutionary changes that produce new species or groups of species

Phylogenetic analysis

the study of evolutionary relationships among organisms or genes

Hybrid Inviability

fertilized egg can’t develop past early embryonic stages

Hybrid Sterility

interspecies hybrid is viable but sterile

Hybrid Breakdown

hybrids viable and fertile but following generations are degenerate

Adaptive Radiation

the process of a single ancestral species evolving into many descendant species that vary in habitat, form or behavior

Hybrid Zones

areas where separated populations can interbreed

Cryptic Species

reproductively isolated and genetically diverse organisms classified as a single species because they look nearly identical

Polyploidy

condition of a cell/organism has three or more sets of chromosomes

Gene Flow

transfer of alleles in or out of a population that occurs when fertile individuals migrate between populations having different allele frequencies

Ernst Mayr

members of one species have the potential to interbreed with one another to produce viable, fertile offspring but can’t successfully interbreed with members of other species

Kevin de Queiroz

General Lineage Concept- each species evolved from a specific series of ancestors and forms a group of organisms with a particular set of characteristics