Natural Selection

Question 1

1. Stabilizing Selection

Answer 1

• Keeps traits in the “middle” (avoids extremes).
  
  • Example: Average-weight babies survive better.

Question 2

2. Directional Selection

Answer 2

• Favors one extreme of a trait.
  
  • Example: Long-neck giraffes survive better.

Question 3

3. Disruptive Selection

Answer 3

• Favors both extremes, not the middle.
  
  • Example: Small and large bird beaks work better than medium ones.

Question 4

4. Sexual Selection

Answer 4

• Traits that attract mates are favored.
  
  • Example: Bright peacock feathers help get mates.

Question 5

5. Balancing Selection

Answer 5

• Keeps different traits in the population.
  
  • Example: Sickle cell gene protects from malaria.

Question 6

6. Artificial Selection

Answer 6

• Humans choose traits they like.
  
  • Example: Breeding dogs or growing sweeter crops.