1) What type of selection causes an increase or decrease in the mean value of a
ID: 12780 • Letter: 1
Question
1) What type of selection causes an increase or decrease in the mean value of aphenotype?
A. disruptive
B. stabilizing
C. drift
D. balancing
E. directional
2) Calculate the frequencies of two alleles at a locus for beak size in a population
with 432 BB individuals, 221 Bb individuals, and 877 bb individuals.
Answer
A. B = 0.12, b = 0.42
B. B = 0.50, b = 0.50
C. B = 0.28, b = 0.57
D. B = 0.35, b = 0.65
E. B = 0.65, b = 0.35
3)What is the predicted frequency of BB individuals in the next generation at
equilibrium (assuming no evolution is occurring)?
Answer
A. 0.42
B. 0.50
C. 0.46
D. 0.12
E. 0.28
Please explain all answers!
Explanation / Answer
1) What type of selection causes an increase or decrease in the mean value of a
phenotype?
A. disruptive
B. stabilizing
C. drift
D. balancing
E. directional
2) Calculate the frequencies of two alleles at a locus for beak size in a population
with 432 BB individuals, 221 Bb individuals, and 877 bb individuals.
Answer
A. B = 0.12, b = 0.42
B. B = 0.50, b = 0.50
C. B = 0.28, b = 0.57
D. B = 0.35, b = 0.65
E. B = 0.65, b = 0.35
432 BB individuals, 221 Bb individuals, and 877 bb individuals.
total -1530
BB=432 /1530=0.28
Bb=221 /1530=0.14
bb=877 /1530=0.57
total========.99
frequency of B= 0.28+ 0.14/2= 0.35
frequency of b= 0.57+ 0.14/2= 0.65
3)What is the predicted frequency of BB individuals in the next generation at
equilibrium (assuming no evolution is occurring)?
Answer
A. 0.42
B. 0.50
C. 0.46
D. 0.12
E. 0.28
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