PCB 4674 Exam 2 (Latest 2026 / 2027
Update) | Review Questions and Answers
| 100% correct| Grade A
Which of the following scenarios would provide evidence that an allele has experienced a
selective sweep in the recent past?
The allele is at high frequency and linkage disequilibrium with surrounding loci is high
If a population of gall flies occurred in an area where birds were present but parasitoid wasps
were absent, which type of selection would you expect to affect gall size?
Directional
Studies of mice inhabiting Gulf and Atlantic coastal showed
NONE OF THESE
- Both have darker coats than mainland mice
- Coat color differences in coastal mice were caused by mutations to the same gene
- Darker mice were less likely to be preyed upon than lighter mice in coastal habitats
In 1977, before the drought on Daphne major, the average beak depth in the finch population was
9.2 mm. Breeding parents that survived the drought had an average beak depth of 9.7 mm. The
difference between these values represents:
The selection differential (S)
A+
