Download Evolution and Natural Selection Name: BS108

Evolution and Natural Selection
BS108-Fall 2010
Name: ________________________________________
1. The bones of vertebrate forelimbs are similar because of descent from a common ancestor. These
forelimbs can be called __________________ structures.
2. When remains of an organism become suspended in fossilized plant sap, it is called ________.
3. Two closely related species that fail to recognize the courtship behavior of each other are said to be
_________________ isolated.
4. Bats, pterosaurs, and birds are examples of _________ evolution.
5. A human example of stabilizing selection is _____________________.
6. When a few survivors of an original population give rise to the next generation of individuals, the
genetic sample is small, a phenomenon called a ________________.
7. The human appendix is an example of a __________ organ, reflecting our evolutionary past.
8. __________________ isolating mechanisms include improper development of hybrids and failure of
hybrids to become established in nature.
9. __________________ isolating mechanisms lead to reproductive isolation by preventing the
formation of hybrid zygotes.
10. The hypothesis that suggests changes occur gradually through time, as evidenced by the fossil record,
is called _____________.
11. A __________ is a separate group of organisms incapable of interbreeding with other such groups.
12. In the Hardy-Weinberg equation p2 +2pq + q2, describe what each genotype is represented by each
member of the equation.
13. What is the process of natural selection?
14. Give an example of behavioral isolation.
15. What does the fossil record tell us?
16. Give two examples of nonrandom mating.