Biology II Practice Test
[Word version]
1. A _________is an interbreeding natural population that is reproductively isolated from other such groups. 2. The development of a new species is called ___________________________. 3. Some of the ways new species may occur are by polyploidy, a genetic bottleneck, mating preference, or ___. 4. There are __________________ models for how speciation occurs. 5. _____________________ is when new species form gradually from a geographically isolated population. 6. ____________________ is when new species arise from within an existing panmictic population. 7. _______ is when new species form at the border between 2 populations and interbreed to form new species. 8. ___________________________ is often induced by environmental changes. 9. Reproductive isolation that occurs before animals mate may be called _______________________. 10. Temporal and behavioral isolation are _______________________ mechanisms. 11. When reproductive structures or genitalia of species are morphologically very different so that fertilization or efficient gamete transfer between the two is not possible, it causes ________________________ isolation. 12. ___________________ isolation can result when individuals of the two species live in the same general area, but inhabit different habitats. 13. Habitat separation can effectively ___________________________ gene flow. 14. _______________ isolation results when sex cells can not meet or fuse together due to the lack of appropriate chemical cues. 15. If the zygote dies, it is an example of ____________________________ isolation mechanism. 16. _________________ is a postmating mechanism where the F1 hybrid is viable but has reduced fertility. 17. With ____________________, F1 hybrids may be fertile, but their succeeding generations become inviable, or sterile. 18. The Hardy-Weinberg Theory predicts how ______________ will be transmitted from generation to generation given a specific set of assumptions. 19. The frequency for getting AA in Hardy Weinberg is equal to __________________. 20. The frequency for getting Aa in Hardy Weinberg is equal to __________________. 21. The frequency for getting aa in Hardy Weinberg is equal to __________________. 22. Hardy-Weinberg states that evolution will not occur in a population _______________________. 23. You can use the H-W results to determine whether __________________ is occurring in a population. List the 7 conditions needed for the Hardy-Weinberg Theory
to apply.
If you have 30 A’s and 50 a’s in a gene pool, what are the proportions of A and of a? Also, what would be the expected frequencies of AA, Aa, and aa? |