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UWEC Bio 222 Exam 1 questions with answers
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UWEC Bio 222 Exam 1 questions with answers
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UWEC Bio 222 Exam 1Homologous structures - correct answer ✔✔Characteristics from a common ancestor, share a
developmental pathway
Analogous structures - correct answer ✔✔Parts that have the same function, but developed from
different lineages
Genetic bottleneck - correct answer ✔✔Losing genetic or phenotypic diversity due to genetic drift
Gene flow - correct answer ✔✔Movement of new alleles from one population to another
Requirements for Hardy-Weinberg equilibrium - correct answer ✔✔1. No mutations
2. Large population so random chance does not cause allele frequency changes
3. No migration in or out of the population
4. Random mating happens
5. No phenotypic advantage is present
What happens if a population is not in HW equilibrium - correct answer ✔✔Evolution
Directional selection - correct answer ✔✔Change of the phenotypic frequency direction over time
Stabilizing selection - correct answer ✔✔Reduction of phenotypic frequency over time (a happy average
is found)
Disruptive equilibrium - correct answer ✔✔Selection pushes the population in two directions at once
Balancing selection - correct answer ✔✔Maintaining genetic diversity through balanced polymorphism
, Genetic drift - correct answer ✔✔Random chance of gene variation in a population
What are the prezygotic isolation mechanisms? - correct 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? - correct answer ✔✔1. Hybrid inviable (fetus does not
develop correctly)
2. Hybrid sterility
3. Hybrid breakdown
Allopatric speciation - correct answer ✔✔Development of new species due to geographic separation
Vicariance - correct answer ✔✔Barrier that prevents migration
Adaptive radiation - correct answer ✔✔Species separates to different environments
Sympatric speciation - correct answer ✔✔Development of new species within a population (hard to do)
Disruptive speciation - correct answer ✔✔Natural selection drives a population in two ways at once
Polyploidy - correct answer ✔✔Duplication of genomes
Gradualism - correct answer ✔✔Species from a common ancestor diverged overtime and acquire unique
morphologies
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