Netissä evoluutiosta, luonnonvalinnasta ja lajiutumisesta
biointeractive; Julkaistu 26.8.2014; The Galápagos finches remain one of our world’s greatest examples of adaptive radiation. Watch as evolutionary biologists Rosemary and Peter Grant detail their 40-year project to painstakingly document the evolution of these famous finches
- 18.2 Formation of New Species
- Figure 3. The only illustration in Darwin’s On the Origin of Species is (a) a diagram showing speciation events leading to biological diversity.
- Figure 4. The northern spotted owl and the Mexican spotted owl inhabit geographically separate locations with different climates and ecosystems. The owl is an example of allopatric speciation
- Figure 5. The honeycreeper birds illustrate adaptive radiation.
- Figure 6. Aneuploidy results when the gametes have too many or too few chromosomes due to nondisjunction during meiosis
- Figure 7. Autopolyploidy results when mitosis is not followed by cytokinesis
- Figure 8. Alloploidy results when two species mate to produce viable offspring.
- Figure 9. These two related frog species exhibit temporal reproductive isolation
- Figure 10. Speciation can occur when two populations occupy different habitat
- Figure 11. The shape of the male reproductive organ varies among male damselfly species…
- Figure 12. Some flowers have evolved to attract certain pollinators
- Figure 13. Cichlid fish from Lake Apoyeque, Nicaragua, show evidence of sympatric speciation
- 18.3 Reconnection and Rates of Speciation
- Figure 1. After speciation has occurred, the two separate but closely related species may continue to produce offspring in an area called the hybrid zone
- Figure 2. In (a) gradual speciation, species diverge at a slow, steady pace as traits change incrementally. In (b) punctuated equilibrium, species diverge quickly and then remain unchanged for long periods of time.