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Allele Frequencies Lab Analysis Questions

Last updated over 4 years ago

18 questions

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Question 1

1.

What do the individual white and black beans represent in this simulation?

Genotype

Phenotype

Alleles

Malaria 

Question 2

2.

What does “allele frequency” mean? How are allele frequencies related to evolution? (HINT: Look in background information OR your objective 19 notes.)

Question 3

3.

Each time you picked out beans you picked out 2 beans which represent an individuals....

Genotype

Phenotype

Malaria

Allele

Question 4

4.

You did not look while picking out beans to represent....

Mutations

Independent assortment of chromosomes during metaphase I 

Crossing over during prophase I 

Random fertilization after meiosis

Question 5

5.

Which of the following is genetically determined

If an individual has malaria

If an individual has sickle cell disease 

Question 6

6.

Which of the following is an environmental factor?

Malaria

Sickle cell disease 

Question 7

7.

What was the general trend observed for Allele A over the three generations? (look at your allele frequency calculations)

Increase

Decrease

Remain the same

Question 8

8.

What was the general trend for Allele S over the three generations? (look at your allele frequency calculations)

Increase 

Decrease

Remain the same 

Question 9

9.

LOOK IN YOUR NOTES ON OBJECTIVE 19. Define microevolution. Is microevolution occuring in this population in Africa?

Question 10

10.

Was your original prediction supported (the one you made on the lab instruction sheet before the lab)? Explain.

Question 11

11.

In Nairobi, (as simulated in the lab), an individual with the genotype __________ will live no matter what. They do not have all sickled cells and are resistant to malaria.

AA

AS

SS

Question 12

12.

In Nairobi, (as simulated in the lab), an individual with the genotype __________ will live but not until reproductive age. They will die young due to Sickle Cell disease and the lack of health care provided.

AA

AS

SS

Question 13

13.

In Nairobi, (as simulated in the lab), an individual with the genotype __________ has a 50% chance of survival. They have normal red blood cells, but if they are bit by a mosquito with malaria they will not survive.

AA

AS

SS

Question 14

14.

In Stockton, an individual with the genotype __________ is at an advantage.

AA

AS

SS

Question 15

15.

Perform the punnett squares and complete the genotype percentages. Then use your findings to answer the next question.

Question 16

16.

In the previous question you crossed the most beneficial genotype for an individual in Nairobi for red blood cell type with that of another (AS x AS). For an individual in Stockton you did the same, but here, since there is no malaria , AA is the most advantageous so you crossed two individuals with that genotypes.

Using your punnett squares explain why in Stockon the S allele is very rare as a result of natural selection, while the A allele is very comon.

Question 17

17.

In question 14 you crossed the most beneficial genotype for an individual in Nairobi for red blood cell type with that of another (AS x AS). For an individual in Stockton you did the same, but here, since there is no malaria , AA is the most advantageous so you crossed two individuals with that genotypes.

Since few people with sickle cell anemia (SS) are likely to survive to have children of their own, why hasn’t the mutant allele (S) been eliminated from the Nairobi population? (Hint: What is the benefit of keeping it in the population?)

Question 18

18.

Scientists are working on a vaccine against malaria. What impact might the vaccine have on the frequency of the sickle cell allele in Africa? (Would it increase or decrease? Why?)