Lesson 4 - Natural Selection (Part 1)

Announcements

- Parent Conferences (I'll send out link for sign-ups on Schoology).

- Unit Assessment in two weeks (first week of March)

- Self-Perception Survey (help me with my research plzzz)

Multiple Choice

If I break my leg, my child has a chance to also be born with a broken leg.

• True

• False

Multiple Choice

True/False: all genetic traits provide an advantage for a species

• True

• False

Multiple Choice

All species within a species have the same genetic traits (there is no variation).

• True

• False

Multiple Choice

True or False: a trait that provides an advantage can become a disadvantage in a different environment.

• True

• False

Multiple Choice

According to natural selection, how does evolution happen?

• Organisms who have a version of a trait that provides an advantage will outcompete those who don't.

• Organisms with a disadvantageous version fo a trait realize that they need to survive so they change to the beneficial one.

• Organisms who outcompete those with disadvantageous version of a trait will have offspring that will have the beneficial version.

• Organisms with the disadvantageous version of a trait all die, leaving only those with the beneficial version alive. Eventually the population is only made up of those individuals.

Multiple Choice

In the mice example, what caused the mice population to evolve? (what was the selective pressure?)

• The lack of food

• The fact that some were light brown and some were black

• The hawk can more easily pick out some of the mice than others

• The rock happened to be dark in color

Multiple Choice

True or False: Natural selection can be predicted.

• True

• False

Multiple Choice

Organisms over-reproduce because:

• they have no self-control

• there is no guarantee that they will all survive

• It gives a species a better chance to evolve

Multiple Select

Select all that are true about genetic traits:

• One trait can have many different variations, with two extremes and a lot of versions in between.

• You are genetically identical to a sibling

• These are traits that a person inherits from their parents

• You can permanently change these traits if you wanted to.

• They generally come in one version

Multiple Select

In a population of bears, the trait for size/height has many variations. Which of the following might be true about the trait?

• It will have extreme versions and "average" versions.

• It will have only extreme versions

• One or more versions of the trait might provide a survival advantage over another

• If a certain height provides an advantage to some individuals, they will out-compete those with a different variation.

• Each bear can choose which variation they will have.

Multiple Choice

This type of selection results in the evolution of two different species because two extreme version of a trait are favored.

• Diversifying selection

• Stabilizing selection

• Directional selection

• None of the above

Multiple Choice

This type of selection occurs because both extreme versions of a trait is a disadvantage to survival

• Diversifying selection

• Stabilizing selection

• Directional selection

• None of the above

Multiple Choice

This type of selection results in a population to primarily have one extreme version of a trait

• Diversifying selection

• Stabilizing selection

• Directional selection

• None of the above

Poll

How comfortable do you feel with the lesson?

• I had a hard time keeping up and understanding it

• It was a little difficult, but with some review I'm sure I'll understand

• Some things were a bit difficult, but overall I understood it well

• The lesson seemed pretty straight-forward to me