6. Which evolutionary effect would be most likely to occur if asmall part of a population relocated to a new area?
- artificial selection
- the bottleneck effect
- the founder effect
- genetic drift
7. Which process will decrease the magnitude of phenotypicvariation between generations?
- disruptive selection
- stabilizing selection
- directional selection
- None; they all increase phenotypic variation.
6. Which evolutionary effect would be most likely to occur if asmall part of a population relocated to a new area?
- artificial selection
- the bottleneck effect
- the founder effect
- genetic drift
7. Which process will decrease the magnitude of phenotypicvariation between generations?
- disruptive selection
- stabilizing selection
- directional selection
- None; they all increase phenotypic variation.
Related textbook solutions
Related questions
1.
Selection | Term | Description |
Basal factors | a. bind to enhancers | |
Activators | b. bind to promoters | |
Coactivators | c. bind to activators | |
Locus control region | d. large enzymatic complex found in the cytoplasm of alleukaryotic cells that down-regulates gene expression | |
RISC | e. influences transcription from multiple genes linked over alarge region of DNA |
2.
Selection | Term | Description |
Gene pool | a. The process in which rare alleles increase in frequency in anew population | |
Genetic drift | b. The sum total of all alleles carried in all members of apopulation | |
Founder effect | c. The proportion of all copies of a gene in a population of aspecific type | |
Evolutionary equilibrium | d. Unpredictable, chance fluctuation in allele frequency thathave a neutral effect on fitness | |
Allele frequency | e. a balance between a new allele and selection against thatallele |
For each scenario, indicate which evolutionary process is most likely to be dominant.
| 1. | Genetic drift. |
| 2. | Outbreeding depression. |
| 3. | Directional selection. |
| 4. | Stabilizing selection. |
| 5. | Balancing selection. |
| 6. | Disruptive selection |
| SCENARIOS |
A) A population of rabbits is primarily preyed upon by coyotes. Only the fastest rabbits escape once seen.
B) In a population of cone snails, the individuals of the most common color suffer the heaviest predation.
C) In widowbirds, males with longer tails attract more mates, but also suffer higher predation.
D) Fledging success is highest among bluebirds with four or five eggs per clutch, although bluebirds lay two to seven eggs per nesting attempt.
F) Among a certain species of fish, both large males that defend high quality nest sites, and smaller males that resemble female fish fertilize many eggs.
G) A Puerto Rican parrot population was decimated by a recent hurricane. It appears that most birds within the path of the storm were killed.
H) In a population of sparrows, scientists noted that the sparrows killed in a particular storm were birds with much longer or shorter than average wings.
I) Fossil evidence indicates that the small, forest dwelling ancestor of modern horses gave rise to much taller (more recent) ancestors as the environment changed to grassland.
J) A population of solid gray ground snakes is well camouflaged on the rocky beaches of the island it occupies. Snakes born to island snakes that mate with the banded snakes from the mainland that occasionally arrive on the island are more likely to be eaten by birds.
K) In ground finches, both small beaked and large beaked birds have higher survivorship than those with intermediate beak sizes.
