Question

In the late 1940's, scientists released a group of chemicals, pyrethroids, to help kill insects in auricular crops. By the year 2000, over 100 insect species were resistant to pyrethroids and scientists had to develop a new plan to kill them.

Explain what happened genetically in the insect population over time as the insects were exposed to pyrethroids.
Responses
A The toxicity of pyrethroids weakened over time.The toxicity of pyrethroids weakened over time.
B The allele for pyrethroid resistance increased throughout the population.The allele for pyrethroid resistance increased throughout the population.
C Pyrethroid resistance became the dominant allele in the insect populations.Pyrethroid resistance became the dominant allele in the insect populations.
D Most insects had the allele for pyrethroid resistance, but it remained masked.

Answer 1

B The allele for pyrethroid resistance increased throughout the population.