UWEC Bio 222 Exam 1 Study Guide
Solutions
Homologous structures - ANSWER-Characteristics from a common ancestor, share a developmental
pathway
Analogous structures - ANSWER-Parts that have the same function, but developed from different
lineages
Genetic bottleneck - ANSWER-Losing genetic or p...
What happens if a population is not in HW equilibrium - ANSWER✔✔-Evolution
Directional selection - ANSWER✔✔-Change of the phenotypic frequency direction over time
Stabilizing selection - ANSWER✔✔-Reduction of phenotypic frequency over time (a happy average is
found)
Disruptive equilibrium - ANSWER✔✔-Selection pushes the population in two directions at once
Balancing selection - ANSWER✔✔-Maintaining genetic diversity through balanced polymorphism
Genetic drift - ANSWER✔✔-Random chance of gene variation in a population
What are the prezygotic isolation mechanisms? - ANSWER✔✔-1. Habitat isolation
2. Temporal isolation
3. Behavioral isolation
4. Grasping appendages
5. Floral structure
6. Gamete recognition
What are the postzygotic isolation mechanisms? - ANSWER✔✔-1. Hybrid inviable (fetus does not
develop correctly)
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