Catalyst #6 Pg. 23Semester 2 Table of Contents

5. Lesson 60- Mutations and Evolution Pg. 15-18

6. Lesson 62- Genetic Variation Pg. 19-227. Lesson 63- Genetic Drift Pg. 23-26

Assigned Vocabulary- Due 2/11

13. Genetic Drift14. Founder’s Effect15. Bottleneck Effect

Vocabulary Due TODAYJustify your answer in complete and sentences.

Announcements

• Evolution Quiz #2- Friday• Notebook Check #1- Next Monday

– Will count as HW/classwork grade= 16.5% of final grade

Get Ready for Vocabulary Race- Take out whiteboard marker

• BEHAVIORAL EXPECTATIONS:– Noise Level 2- Can’t hear you from a few feet away– Facing forward– Bottoms in chairs whole time– Stay in seat

• DIRECTIONS:– Answer your specific question– Pass up the whiteboard– Last person in row hold up whiteboard– I’ll take 1st 2nd, and 3rd place– Team that wins will get bragging rights!

Round 11. This is a change in a species over time; process of biological

change by which descendents come to differ from their ancestors.

2. This is a mechanism by which individuals that have inherited beneficial adaptations produce more offspring on average than do other individualsThis type of white blood cell phagocytizes small particles

3. This person published On the Origin of the Species by Means of Natural Selection

4. This is a measure of an organism’s ability to survive and produce offspring relative to other members of a population

Round 11. This is a change in a species over time; process of biological

change by which descendents come to differ from their ancestors.

1. Evolution2. This is a mechanism by which individuals that have inherited

beneficial adaptations produce more offspring on average than do other individuals

1. natural selection3. inherited trait that is selected for over time because it allows

organisms to better survive in their environment 1. Charles Darwin

4. This is a measure of an organism’s ability to survive and produce offspring relative to other members of a population

1. fitness

Round 2

1. differences in physical traits of an individual from the group to which it belongs. You often give this

2. ability of a trait to be passsed from one generation to the next

3. inherited trait that is selected for over time because it allows organisms to better survive in their environment

4. body part that is similar in structure on different organisms but performs different functions

Round 21. differences in physical traits of an individual from the group

to which it belongs. 1. variation

2. ability of a trait to be passsed from one generation to the next

1. inheritability3. inherited trait that is selected for over time because it

allows organisms to better survive in their environment 1. adaptation

4. body part that is similar in structure on different organisms but performs different functions

1. Homologous structure

Round 3

1. remnants of an organ or structure that functioned in an earlier ancestor

2. the study of the earliest stages of growth and development of plants and animals

3. collection of alleles found in all of the individuals of a population

4. proportion of one allele, compared with all the alleles from that trait, in the gene pool

Round 31. remnants of an organ or structure that functioned in

an earlier ancestor 1. Vestigial structure

2. the study of the earliest stages of growth and development of plants and animals

1. embryology3. collection of alleles found in all of the individuals of a

population 1. Gene pool

4. proportion of one allele, compared with all the alleles from that trait, in the gene pool

1. Allele frequency

Question of the Day Pg. 23

• Use your prior knowledge to answer the following question on pg. 23

• How does genetic drift affect the diversity of a population?

Get Ready for Notes Pg. 24-25Title: Genetic DriftNo HW questions

• Behavior:– Silent– Not looking at ipads– Head up– Facing forward

Genetic Drift

Survivors are lucky, not more fit

Deceased are unlucky, not less fit

DNA frequency in a population changes simply by CHANCE not

fitness

Causes of Genetic Drift Random events:

1. natural disasters – hurricane, volcano, tsunami, earthquake, fire, etc

2. stepped on, ran over, picked up, put on a boat, stuck in a car, stuck to fur or clothing

3. at the wrong place at the wrong time

FOUNDER'S EFFECT:

some individuals of a population colonize a new habitat

ex: Columbus bringing organisms to USA

Spain: DNA Frequency66% pink33% red

S. America: DNA Frequency25% pink75% red

Bottleneck Effect: few survivors are left to reproduce

ex Hurricane Katrina

Before Katrina: DNA Frequency66% pink33% red

After Katrina: DNA Frequency40% pink60% red

survivors!

How does genetic drift affect the diversity of a population over time?

Genetic drift decreases diversity. In this case yellow and pink DNA are gone, and red DNA is now the majority.

Genetic drift = decrease in DNA diversity

Let's Do This Together: Did this population of Rivasitus

undergo genetic drift after a tornado killed all except one X and one O?

Allele frequency of Original Population: 13/26 X's = 50% 13/26 O's = 50%

Allele frequency of New Population: 1/2 X's = 50% 1/2 O's = 50%

X O O X X X O O O O X X X X X X X X X OO O O O O O

X O

survivors!

Let's Do This Together: Did this population of Rivasitus

undergo genetic drift?Original Population: 13/26 X's = 50% 13/26 O's = 50%

New Population: 1/2 X's = 50% 1/2 O's = 50%

X O O X X X O O O O X X X X X X X X X OO O O O O O

X ONODNA frequency

the SAME before and after!

You Try: Did this population of Rivasitus

undergo genetic drift?

Allele Frequency of Original Population: __/__ X's = ___% __/__ O's =___%

Allele Frequency of New Population: __/__ X's = __% __/__ O's = __%

X O O X X X O O X X

X X O O O O

XOXX O

You Try: Did this population of Rivasitus

undergo genetic drift?Original Population: 8/16 X's = 50% 8/16 O's =50%

New Population: 3/5 X's = 60% 2/5 O's = 40%

X O O X X X O O X X

X X O O O O

XOXX O

YES!DNA frequency

different before and after!

Check your understanding!

• Watch the video then answer the questions

• http://glencoe.mcgraw-hill.com/sites/9834092339/student_view0/chapter20/simulation_of_genetic_drift.html

• On the top of page 24 write how many questions you got correct out of 5

Genetic Drift Investigation PG. 26 (10 MIN)

• Quietly work with your partner to answer the question on in your notebook

• DO NOT WIRTE ON WORKSHEET

REVIEW OF INVESTIGATION

GENETIC DRIFT WITH DICE: WORM Coloring (20 MIN) PG. 26

WORM REVIEW (5 MIN)

ANSWER QUESTION OF THE DAY Pg.26

• How does genetic drift affect the diversity of a population?

• Draw a picture to help explain your answer

Evolution Video?