Understanding Genetic Drift Worksheet for Evolution Class

1. Genetic drift worksheetGlue on page 32Fill in charts and yell “checkpoint” individually. Then answer all questionsDraw if you need to

2. Pick up YOUR rainbow fish from blue box, period 6 folder and glue it to pg 37

3. Lightening • H alleles was DECREASED • h allele was INCREASED • Falcons will have more small beaks since more of those survived the lightening strike • This is genetic drift because the ones that survived was RANDOM

4. Tsunami • F alleles INCREASED • f allele DECREASED • Jerboas will have more thick fured individuals in the future since more of those survived • This is genetic drift because the ones that survived was RANDOM

5. Track worksheets on pg 98c (pgs 28-29; 32) ------------------------------------------------------- Standard 7d I can determine why variation is necessary for the survival of a population.

6. Meiosis and Mutations create variation among individuals

7. Why do you NEED variation in a species? Why not look identical?

8. On the TOP of pg 33Draw 2 populations(many individuals of the same species)1) High diversity/variation2) Low diversity/variationEXPLAIN--Which population is more likely to survive an environmental change, one with great diversity/variation or one with littlediversity/variation?

9. How did variation save the Peppered Moth species?Bottom of page 33 • Peppered moth variation is ________ and _______. When __________happened___________________ (use individual, environment, and variation in answer) • https://kleinsclasses.wikispaces.com/file/view/apes-05-moth_change.swf

10. Selection Graphs Look at allele frequency BEFORE and AFTER

11. Page 34 • Types of Selection

12. The middle/average is selected for

13. Directional Selection • The phenotypes on one end are selected for

14. Disruptive selection—The phenotype in the middle is selected AGAINST

15. Glue on pg 35-36 • Number 1--Giraffes • A—Label most fit on graph A • B—Label least fit on graph A • C—Draw graph B • D— What type of selection?

16. Geographic isolation • Population • Reproductive isolation • Natural selection • Reproductive barriers • Speciation

18. Find new seat and pick up a “When polar bears and grizzlies mate” article Make 4 boxes on pg 31 Box 1—Summarize article Box 2—How does this article connect with this class Box 3—Draw a diagram related to this article Box 4—What you want to know more about

20. Grizzly–polar bear hybrid (also pizzly bear, prizzly bear, or grolar bear • Not sterile so they can make healthy babies! • Sterile means you can’t have babies

21. Grades this Thursday • 2 quizzes make up your grade—7a, 8d, 8a • Retake quizzes this week • Work habits grade based on if you come into tutoring

22. 8.d I know how reproductive or geographic isolation affects speciation. 1. Speciation requires which of the following? A. Behavioral Isolation B. Geographic Isolation 2. Which of the following is NOT a pre-zygotic isolating mechanism? C. production of sterile hybrids 3.Behavioral isolating mechanisms may occur when two species have different B. courtship displays 4.A species is defined as individuals that B. can reproduce with each other

23. Explain how one species of mushroom can become two species of mushroom. Underline key terms and include how you know they are two separate species. -There was a geographic barrier that separated the mushrooms. On both sides there were mutations. These mutations gave an advantage and those mushrooms were able to eat more and reproduce more. -We know we have two species of mushrooms because they cannot reproduce and make normal babies.

24. 7.a I know why natural selection acts on the phenotype rather than the genotype of an organism 6. A predator can see • phenotype only 7. Which of the following best describes the difference between phenotype and genotype? B. A phenotype is the way a trait is expressed, while a genotype is the combination of alleles that codes for it. 8. When the environmental conditions change, natural selection will select individuals that A.have the traits that are most beneficial

25. 9) In a population of birds, one individual bird has particularly long wings, which make it better than its fellow birds at catching prey. However, this bird is sterile. • Is natural selection likely to act in this population to increase the number of birds with this long-winged trait in future generations? Explain. Sterile means that it cannot have offspring. In natural selection, the ones with the advantage can eat more AND have more babies. Since it cannot have babies this trait will not be passed on.

26. 10. Give an example of natural selection acting on the phenotype of an individual.

27. How does these diagram show genetic drift? Marble=Alleles

28. Genetic Drift affects small or large populations more? Why? Small Pop Large Pop

29. On the bottom of pg 27 • Genetic drift causes the shift in alleles • Genetic drift affects small populations more than large ones because_____________ Small Pop Large Pop

30. Rainbow fish • What would be the phenotypes for each genotype below? G is completely dominant to R G is completely dominant to Y R and Y are incompletely dominant

31. #2—Can 2 red fish make a green offspring? #3—Can 2 orange fish make a yellow offspring? #4—is Yes show me how #5-8

32. Environment

33. Change in environment

34. Rainbow fish How did the allele frequency change over 4 generations?