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Speciation

Across
Posses two or more complete sets of chromosomes, caused by errors in cell replication
Breeding occurs between members of the same species, offspring has more than one set of chromosomes
Hybrids between two populations or species overlap and some interbreed
Single lineage that evolves into many descendant species
Share single common ancestor
Down
Breeding between members of different species, offspring can have more than one set of chromosomes
Occurs when populations are separated geographically
No geographic isolation or gene flow
Natural selection for traits that prevent interbreeding between two populations
Physical splitting of habitat creates barriers that separates a population into sub populations