Period 2 Unit 10 Study Guide

Population stabilizes on a particular trait value.

11. How are genetic drift and natural selection the same? (Hint: what do they both involve?)

when 2 or more species reproduce at different times like in may there's some flowers that bloom in that month and theirs some not in that month

5) two species cannot breed and produce offspring capable of breeding. Ex: mules

An example is when we did the moth activity one species survived at a larger rate.

12. What kind of traits are best displayed by a bell-shaped curve? Why?

5.) What is reproductive isolation? Give an example.

6. What is behavioral isolation? Give an example.

7. What is temporal isolation? Give an example.

Population stabilizes on a particular trait value.

1. Sketch what directional selection looks like and give an example (think about scenarios we have worked on in class).

Disruptive selection is a type of natural selection that selects against the average individual in a population.

#6- When 2 populations are capable of interbreeding but have differences in courtship rituals or other reproductive strategies. Ex: two breed able birds not mating because of difference in mating calls.

10. How are genetic drift and natural selection different? (Why is the gene pool changing?)

4. A:When organisms are separated by a geographical barrier such as a river, ocean, or mountain and cannot mate.

- Team Teacher

4. What is geographical isolation? Give an example.

3. Sketch what disruptive selection looks like and give an example (think about scenarios we have worked on in class).

2. Sketch what stabilizing selection looks like and give an example (think about scenarios we have worked on in class).

21 Speciation

22 Mutations or sexual reproduction

We can say that the horse population is evolving because the allele frequency is changing!

17. A factor that could influence would be if this gene is helping their fitness.

13. The more closely related two different organisms are the more similar / different (circle one) their genes are.

14. Single-gene traits usually have more / less (circle one) phenotypes compared to polygenic traits.

15. Natural selection acts on __________________________ not ______________________________

Similar

Less

Phenotype not genotype

11. they both change allele frequencies over time

23. There are 2 types of pocket mice: mice that have brown fur and mice that have white fur. Normally, the environment the mice live in is a dark forest covered in trees. But lately, humans have come in and cleared most of the trees, which allows more snow to reach the ground.

a. What is the variation in the species? (what is the difference between the two mice?)

          Fur color

b. What mouse is being selected for (natural selection)? (meaning, which one has the trait that makes it the MOST successful in its current environment?)

         The white-furred mice

21. The Galapagos finches and tortoises are great examples of what process? _______________________

22. Where does variation in a population come from? (Hint: There are 2 sources) Which is more common?

20. What is genetic equilibrium?

17. A small population of bears are washed ashore on an island. One of the bear’s descendants has a single gene mutation that gives it a longer neck. What factor(s) could influence whether that new allele will increase?

16. In a horse population, the allele frequency for coat color changes from 35% to 50%. What can we say about the population of horses?

9. What is the difference between the Founder’s Effect and the Bottleneck Effect?

8. How do we know that evolution is occurring? (What can we measure?)

With any change in relative frequency we can see that evolution is occuring. You can measure evolution with alleles.

Geographic isolation would be more common in mice compared to a population of birds because birds can fly we can take this back to the squirrels and the grand canyon if two mice are separated they are not able to cross but if there is one population of birds and another population of birds they can just fly to the other side

12. Polygenic, there are multiple traits that play a role in the phenotype.

Condition of gene pool where the alelles don't change from generation to generation.

genus

bottleneck effect is the change in allelic frequency after a dramatic reduction and founders effect is when the population gets seperated

23. There are 2 types of pocket mice: mice that have brown fur and mice that have white fur. Normally, the environment the mice live in is a dark forest covered in trees. But lately, humans have come in and cleared most of the trees, which allows more snow to reach the ground.

Which is the most “fit”? WHY?

23. A: The white mice are now more fit for the environment because the snow is covering the ground so they are better camouflaged than the brown mice.

- Team Teacher

10. A - Genetic drift is by CHANCE. Natural selection "chooses" the animals that are best fit for that environment.

- Team Teacher

two new populations must be formed from one original population and they must evolve in such away that it becomes impossible for individuals from two new populations to interbreed

24. If you are looking at the scientific name of an animal species which species will be the most closely related?

 the ones from the same ________________

(Class, Family, Genus, Order)

19. How do we know if speciation has occurred? (Hint: what has to become separated?)

18. Why would geographic isolation be more common for a population of mice compared to a population of birds?