In the 1800s humans hunted elephant seals in the arctic. At one point, the wild
population of seals was reduced to only 20 individuals, greatly reducing the gene
pool.
As elephant seals have reproduced and recovered from danger, this sudden
shrinkage of the gene pool would be classified as __
O A catastrophic event
O A bottleneck event
A mutation event
The founder's effect

Female luna moths (actias luna) attract males by emitting chemical signals that spread through the air. a male hundreds of meters away can detect these molecules and fly toward their source. the sensory organs responsible for this behavior are the comblike antennae visible in the photograph shown here. each filament of an antenna is equipped with thousands of receptor cells that detect the sex attractant. based on what you learned in this chapter, propose a hypothesis to account for the ability of the male moth to detect a specific molecule in the presence of many other molecules in the air. what predictions does your hypothesis make? design an experiment to test one of these predictions.