Advertisement Upgrade to remove ads

The migration of reproductive individuals between populations results in a movement of alleles called:

gene flow

Which of the following is the best measure of an organism's fitness?

the number of offspring it produces

Evolution is defined as:

a change in the frequency of alleles in a population over time

A gene pool consists of:

the total of all alleles present in a population

The origin of all genetic variation is:

mutation

Disruptive selection occurs when:

individuals with extreme values of a trait have greater fitness than individuals with intermediate values of the trait.

Which is not one of the four ways by which evolution occurs?

Heritability

Three conditions are necessary for natural selection to occur. They are:

Variation in traits, inheritability of variation, differential reproductive success

Individuals with more favorable traits for a given environment will be more _________ and thus ___________ more than those with less favorable traits.

fit, reproduce

The selection of antibiotic resistant bacteria is an example of:

directional selection

Exceptionally large babies increase a mother's mortality risk when giving birth and exceptionally small babies tend to die at birth or shortly afterward. For these reasons, birthweight in human babies is generally what type of natural selection? Explain your answer.

subject to stabilizing selection

What is the major difference between artificial and natural selection?

Natural selection acts without the input of humans; artificial selection requires human input.

Explain why some animals have evolved "extreme" traits related to mating habits (hint: think praying mantis or spider example)

While dying for the sake of reproduction may seem extreme, it increases the parents fitness if their alleles are passed to the next generation. It also allows nutrients from their bodies to be used to nourish either the female (praying mantis) or offspring (newly hatched spiders).

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set