1What are the three types of selection?
Directional, stabilizing, and disruptive.
2What is directional selection?
Favors individuals with extreme traits.
3What is an example of directional selection?
Antibiotic resistance in bacteria.
4What happens to the mean in directional selection?
It shifts towards the advantageous trait.
5Why does antibiotic resistance evolve?
Survival of resistant bacteria after exposure.
6What is stabilizing selection?
Favors traits in the middle of a range.
7What is an example of stabilizing selection?
Human birth weight.
8Why is medium birth weight advantageous?
Low and high weights face survival issues.
9What happens to variation in stabilizing selection?
It decreases over time.
10How can data on selection be interpreted?
By analyzing shifts in trait distributions.
11What graph feature indicates stabilizing selection?
The curve becomes narrower.
12What tool is used to test antibiotics?
Agar plates with bacterial cultures.
13How is bacterial growth inhibited on agar?
By zones of inhibition around antibiotics.
14What is the aseptic technique used for?
Preventing contamination in microbial work.
15Why are aseptic techniques important?
To ensure accurate and safe results.
16What safety practices are needed for cultures?
Sterilization and working near a flame.
17What is a potential cause for trait shifts?
Environmental changes or human impact.
18What do error bars on a graph show?
Variation in data measurements.
19What selection does the teenage population shift show?
Directional selection.