What do the individual white and black beans represent in this simulation?
What does “allele frequency” mean? How are allele frequencies related to evolution? (HINT: Look in background information OR your objective 19 notes.)
Each time you picked out beans you picked out 2 beans which represent an individuals....
You did not look while picking out beans to represent....
Which of the following is genetically determined
Which of the following is an environmental factor?
What was the general trend observed for Allele A over the three generations? (look at your allele frequency calculations)
What was the general trend for Allele S over the three generations? (look at your allele frequency calculations)
LOOK IN YOUR NOTES ON OBJECTIVE 19. Define microevolution. Is microevolution occuring in this population in Africa?
Was your original prediction supported (the one you made on the lab instruction sheet before the lab)? Explain.
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.
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.
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.
In Stockton, an individual with the genotype __________ is at an advantage.
Perform the punnett squares and complete the genotype percentages. Then use your findings to answer the next question.
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.
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?)
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?)