Which of the following is an example that results from directional selection?
A)The birth weight at which newborn humans are most likely to survive and the average weight of newborn humans are about the same.
B)There is an increase in antibiotic-resistant strains of bacteria.
C)There is an increase in the number of different breeds of dog.
D)Garter snakes with different coloration patterns behave differently when threatened.

Question

Quizplus · Accepted Answer

Directional selection occurs when individuals with a certain trait or variation are more likely to survive and reproduce, leading to an increase in frequency of that trait within a population over time. In the case of antibiotic-resistant bacteria, the use of antibiotics selects for individuals with mutations or traits that make them resistant, leading to an increase in the frequency of antibiotic-resistant strains within the bacterial population.

Which of the Following Is an Example That Results from Directional