1. When comparing a range of viral populations in a particular year what characteristic is most...

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Biology

1. When comparing a range of viral populations in a particularyear what characteristic is most associated with survival of thepopulation to the next year.
A) a high rate of change in sequences at antigenic sites
B) a high rate of change in sequences generally
C) movement to a new host
D) ability to overwhelm the immune system
E) a low mutation rate
2. Some sharks migrate from the ocean to live in a freshwaterlake. After a few generations scientists sequence an enzymeinvolved with moving ions across cell membranes in both theancestral ocean population and the lake population. Aftercorrecting for the number of possible changes they found 3.3nonsynonymous changes in the sequence for every synonymous change.This is evidence for which of the following?
A)No selection on the enzyme
B)Positive (directional) selection on the enzyme
C)Negative (stabilizing) selection on the enzyme
D)Ambiguous (disruptive) selection on the enzyme
3. Which evolutionary forces will tend to cause populations todiverge from one another genetically when they (the populations)are geographically isolated?
A) mutation, drift, selection
B) mutation, drift, migration
C) migration, drift, mutation
D) migration, selection
E) migration, selection, drift

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1 A a high rate of change in sequences at antigenic sites this would ensure that the bacteria keeps changing the proteins and structures which are recognized by the host immune system If the immune system fails to recognize the mutated See Answer

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