Across
- 1. : Evolution of barriers that prevent gene flow between populations
- 4. : Hybrid zone maintained by balance between dispersal and selection against hybrids
- 5. : Speciation caused by geographic isolation and absence of gene flow
- 6. : Model assuming constant substitution rates across all lineages
- 7. : Retention of ancestral polymorphisms causing discordant gene trees
- 9. : Use of fossils to estimate absolute divergence times
- 20. : Speciation occurring without geographic separation
- 22. : Movement of alleles among populations via migration and reproduction
- 24. : Re-evolution of an ancestral character state
- 25. : Region where divergent populations meet and produce hybrids
- 27. : Defines species as the smallest diagnosable monophyletic group
- 30. : Relative reproductive success of individuals or genotypes
- 31. : Rapid diversification into multiple ecological niches
- 34. : Isolation preventing mating or fertilization before zygote formation
- 36. : Spatial gradient in allele frequencies across a geographic area
- 37. : Homologous genes diverged by speciation events
- 39. : Selection favoring different phenotypes in different environments
- 41. : Similarity due to shared ancestry
- 42. : Potential niche without competition or predation
- 43. : Defines species based on reproductive isolation among natural populations
- 44. : Reduced survival of hybrid offspring
- 45. : Different traits evolving at different rates within a lineage
Down
- 2. : Phylogeny representing relationships among species
- 3. : Independent evolution of similar traits in closely related lineages
- 8. : Hypothesis of approximately constant rates of molecular evolution
- 10. : Genome duplication within a single species
- 11. : Expansion of niche due to reduced competition or predation
- 12. : Phylogenetic principle minimizing the number of evolutionary changes
- 13. : Phylogeny representing the history of a particular gene
- 14. : Homologous genes produced by gene duplication
- 15. : Polyploidy following hybridization between species
- 16. : Reduced fertility of hybrid offspring
- 17. : Model allowing rate variation among lineages
- 18. : Ability of a genotype to produce different phenotypes under different conditions
- 19. : Isolation reducing hybrid viability or fertility after fertilization
- 21. : Independent evolution of similar traits in distantly related lineages
- 23. : Speciation along environmental gradients with limited gene flow
- 26. : Measure of relative fitness reduction of a genotype
- 28. : Non-random mating based on phenotypic similarity
- 29. : Portion of niche occupied under biotic constraints
- 32. : Random fluctuations in allele frequencies due to sampling effects
- 33. : Similarity not due to common ancestry
- 35. : Selection strengthening prezygotic isolation due to low hybrid fitness
- 38. : Incorporation of genes from one species into another through hybridization
- 40. : Range of environmental conditions and resources used by a species