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POPULATION GENETICS, SELECTION, AND EVOLUTION

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Last updated 21 days ago
30 questions
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Question 1
1.

Total number of alleles in population =

Question 2
2.

Probability of dominant allele (decimal) =

Question 3
3.

Probability of recessive allele (decimal) =

Question 4
4.

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Question 5
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Question 6
6.

Hardy Weinberg Equilibrium - link - more help (Bozeman)

Question 7
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Question 8
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Question 9
9.

Sickle Cell Disease - starting population = total = 60 people; 15 homozygous dominant (HbA/HbA), 30 heterozygous (HbA/HbS), 15 homozygous recessive (HbS/HbS). Check the data table below to make sure you understand the data.

Question 10
10.

Go to https://www.biologysimulations.com/population-genetics. Set everything to what you see here... The red alleles is the A frequency and the Blue allele is the S frequency on the chart.
Simulation 1 - In this sim the allele frequencies are both .5, the starting population is as the data table above sets up and their is no selective advantage for any genotype. Run the sim 5x for 5 generations (the smallest possible), recording the final allele frequencies for each sim on your own separate data table. Take the mean of the 5 allele frequencies that you recorded and record in the 1.2 data table here

Question 11
11.

For simulation 1, is evolution occuring? How do you know? If so, which of the five fingers is acting to cause evolutionary change? What would you have to do to bring this population into Hardy Weinberg equilibrium?

Question 12
12.

Simulation 2 - 100% negative selection against sickle cell anemia - HbS/HbS - set up as you see below - then run the sim 5x for 5 generations (the smallest possible), recording the final allele frequencies for each sim on your own separate data table. Take the mean of the 5 allele frequencies that you recorded and record in the 2.1 data table here


Question 13
13.

Sim 2 Generation 2 - Repeat the same 100% negative selection continuing from where you left off in table 2.1 - So type your 2.1 genotype frequencies into the sim and run the sim 5x for 5 generations (the smallest possible), recording the final allele frequencies for each sim on your own separate data table. Take the mean of the 5 allele frequencies that you recorded and record in the 2.2 data table here

Question 14
14.

For simulation 2 (both parts), is evolution occuring? How do you know? If so, which of the five fingers is acting to cause evolutionary change? What would you have to do to bring this population into Hardy Weinberg equilibrium?

Question 15
15.

Heterozygote Advantage - Sim 3 will model the heterozygote advantage - set the sim as you see below - run the sim 5x for 5 generations (the smallest possible), recording the final allele frequencies for each sim on your own separate data table. Take the mean of the 5 allele frequencies that you recorded and record in the 3.1 data table here

Question 16
16.

Sim 3 Generation 2 - Repeat the same 100% negative selection ALONG WITH the 50% selections AGAINST AA (heterozygote advantage) continuing from where you left off in table 3.1 - So type your 3.1 genotype frequencies into the sim and run the sim 5x for 5 generations (the smallest possible), recording the final allele frequencies for each sim on your own separate data table. Take the mean of the 5 allele frequencies that you recorded and record in the 3.2 data table here

Question 17
17.

For simulation 3 (both parts), is evolution occuring? How do you know? If so, which of the five fingers is acting to cause evolutionary change? What would you have to do to bring this population into Hardy Weinberg equilibrium?

Question 18
18.

What simulation might represent a population of people of African descent living in the Minnesota OR a population of Africans living in the DRY highlands of Africa? Explain!

Question 19
19.

What simulation might represent a population of people living in the moist lowlands of East Africa? Explain!

Question 20
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Question 21
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Question 22
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Question 23
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Question 24
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Question 25
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Question 26
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Question 27
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Question 28
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Question 29
10:48
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Question 30
30.

Explain how CRISPR is being used to cure sickle cell anemia

Calculating Allele Frequencies - p + q = 1
q =
.25
p is the
.75
p + q = 1
1
q is the
dominant allele
p + q =
recessive allele
p =
is used to figure out allele frequencies
Calculating Genotypes Frequencies - p2 + 2pq + q2 = 1
p2 = (percent)
.0625
BB = (decimal)
.563
p2 + 2pq + q2 = 1 is used to figure out...
.376
q2 = (percent)
6.25%
Bb = (decimal)
37.6%
2pq = (percent)
56.3%
bb = (decimal)
genotype frequencies
Question 20
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Question 21
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Question 22
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Question 23
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Question 24
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Question 25
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Question 26
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Question 27
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Question 28
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Question 29
29.

What is different about this new treatment for SCD?
she received a combination of gene therapy with CRISPR
she received a bone marrow transplant
she received a bone marriow transplant form someone who did not have SCD
The discovery of CRISPR - Cas9 sequences in bacterial DNA represented the discovery of a type of bacterial ....
circulatory system
immune system
nervous system
movement system
If a bacterium survives a viral infection, it will ...
copy some of the viral proteins to recognize them later...
copy some of the viral DNA and insert it into its own genome
If a bacterium has a CRISPR sequence that matches a new infection, it will
copy that viral sequence into RNA
attach the copied viral to CAS enzymes
the CAS enzymes will target the viral DNA with the help of the CRISPR
The viral DNA will be cut up which prevents the infection
What was different about this DNA cutting system?
it was non-specific
it was highly specific and could be "programmed" to recognize and cut exact DNA sequences
Not only can this system cut DNA specifically, but ....
DNA repair can replace or edit by inserting a new sequence
sometime the viral DNA can repair itself
the cut DNA will randomly mutate
BCL11A is a gene that makes a transcription factor that ....
makes adult hemoglobin
makes fetal hemoglobin
causes less adult hemoglobin to be made
suppresses fetal hemoglobin in adults
What is done to the BCL11A gene?
it is modified to work more quickly
it is cut to stop its expression
it is modified to make more fetal hemoglobin
What were the results of this procedure?
Less adult hemoglobin is being made
Reintroduced stem cells have increased in population and are producing significant amounts of fetal hemoglobin
all sickle cell symptoms have been eliminated
What is different about CRISPR compared to earlier gene therapy procedures?
it is cheaper
it is faster to test
it is likely easier to target specific changes