Question

Mammals such as humans show a behavior known as the flight or fight response. Explain how natural selection was likely involved in the development of this behavior that can be observed in humans today.

a. Individuals showing fight or flight behavior was more likely to survive than individuals lacking the trait. This trait got randomly selected by natural selection, thus became preferentially incorporated into the human lineage.
b. Individuals showing fight or flight behavior were more likely to survive than individuals lacking the trait. Sudden, inheritable changes were naturally selected, which included the fight or flight behavior. Thus, this response was incorporated into the human lineage.
c. Individuals showing fight or flight behavior were more likely to survive than individuals lacking this trait. Therefore surviving individuals passed on their trait to offspring while nonsurviving individuals do not. Thus, this response became incorporated into human lineage.
d. Individuals showing fight or flight behavior were not more fit than individuals lacking this trait. However, the trait was selected by natural selection due to a random chance event in the gene frequency of individuals showing fight or flight behavior.

Answer 1

The flight or fight response observed in humans is likely the result of natural selection. Individuals showing fight or flight behavior were more likely to survive, allowing them to pass on the trait to their offspring and increasing its prevalence in the human lineage.

Step-by-step explanation:

The flight or fight response observed in mammals, including humans, is likely the result of natural selection. Individuals showing fight or flight behavior were more likely to survive than individuals lacking the trait. This allowed them to pass on the trait to their offspring, increasing its prevalence in the human lineage over time. This suggests that the fight or flight behavior was incorporated into the human lineage through natural selection.