APUS BIOL133 Exam 4- Chapters 16-20.

Question 1 of 40 2.5 / 2.5 Points Which individuals in a population are most important in determining the numbers for the Hardy- Weinberg principle since one can tell their genotype from their phenotype? • A. mutated • B. fittest • C. homozygous recessive • D. homozygous dominant • E. heterozygous Feedback:Correct Question 2 of 40 2.5 / 2.5 Points Gradual speciation is more likely to be associated with small changes building up in • A. geographically diverse areas • B. genes associated with DNA synthesis • C. ability to reproduce asexually • D. stable environments Feedback:Correct Question 3 of 40 2.5 / 2.5 Points The accumulation of mutations in a population over generations leads to • A. evolution • B. nonrandom mating • C. extinction • D. decreased variability Feedback:Correct! Question 4 of 40 2.5 / 2.5 Points Proteins that respond to environmental stimuli to prevent the binding of transcription factors are known as . • A. termination factors • B. initiation factors • C. activators • D. repressors Feedback:Learning Objective: Explain how enhancers and repressors regulate gene expression Question 5 of 40 2.5 / 2.5 Points What would be at the base of the evolutionary tree of life? • A. primary ancestor • B. universal ancestor • C. divergent ancestor • D. root ancestor Feedback:Correct Question 6 of 40 2.5 / 2.5 Points Which population would be more likely to be affected by genetic drift? • A. snails on an island in the Mississippi River • B. mosquitoes in Wisconsin • C. cats in New York City • D. oak trees in Canada Feedback:Correct Question 7 of 40 2.5 / 2.5 Points A species that is well studied so that we can learn more about the way we work is call a ...................................................continued..............................................