Question

In a population of spiders, there is a protein that is coded in the DNA to make venom. In a particular spider, there was a protein variation due to a change in the genetic code. This protein variation caused the spider’s venom to be stronger to kill its prey. This genetic variation was passed down to offspring and was favored due to the amount of time shortened to eat its prey.
Event Causing Genetic Variation in the Gene Pool:

Explanation:

Answer 1

I'm not sure what you're asking, but if you're looking for a word to describe this change its "mutation"