When a genetic bottleneck happens, a species’ population . it’s unlikely that the species will have a high degree of , a population characteristic that provides a species with a greater chance of surviving changes to its environment. 1. a. increases slowly b. declines rapidly c. remains constant for long periods of time 2. a. genetic diversity b. mutations c. sexual selection

The hershey and chase experiments involved the preparation of two different types of radioactively labeled phage. which of the following best explains why two preparations were required? a. the bacteriophage used in the experiments was a t2 phage. b. it was necessary that each of the two phage components, dna and protein, be identifiable upon recovery at the end of the experiment. c. each scientist had his own method for labeling phage, so each conducted the same experiment using a different isotope. d. establishing the identity of the genetic material required observation of two phage generations.