Exam 11: Mechanisms of Evolution

A student with Strep throat (caused by a strain of bacterium)is given a prescription for an antibiotic and is told to take the drug for two weeks.After a week,the student feels better and stops taking the drug.Two months later,the student again shows symptoms of Strep throat and decides to finish the leftover antibiotic rather than going to the doctor again.Two months later,the student develops Strep throat for a third time and returns to the doctor.This time,the antibiotic does not work.The doctor runs a test and discovers that the bacterial strain the student is carrying is antibiotic resistant.What most likely happened?

The color of a certain species of beetle is determined by a single gene.Two beetles homozygous for green coloration (meaning they have two copies of the green allele)produce a single offspring with brown coloration.Brown color appeared in this offspring as a result of

During gene flow,

Convergent evolution produces

An example of evolution that has been readily observed is

Match each example to one of the processes below. -A large boulder rolls down a mountain and kills all the flowers in its path.

Match each example to one of the processes below. -An area consists of dark and light rocks.Mouse populations that live on the dark rocks tend to be darkly colored;mouse populations that live on the light rocks tend to be lightly colored.

Sexual selection can result in an increased frequency of alleles,which

A chance evolutionary change occurring in small populations is referred to as ________.

What is genetic drift?

For a population to evolve,there must be genetic differences between organisms in that population.These differences arise by

A fisherman catches one trout from each of two ponds.Pond A contains 100 trout and pond B contains 1,000 trout.Which population is more affected by the fisherman?

Which of the following is NOT a step in the evolutionary process?

Both insects and humans evolved jointed legs to allow locomotion on land.These structures are considered analogous because insects and humans

Disruptive selection operates whenever

Gene flow occurs

A gene has two alleles,D and The frequency of the D allele is 0.2.What is the frequency of the d allele?

The only mechanism of evolutionary change that is not influenced by chance events is ________.

The result of convergent evolution is ________ traits.

Match each example to one of the processes below. -Algae attach to a boat motor and are transported to a new lake where they establish a new colony.