Question 3 (8 pts). Before a drought arrives in the environment, a population of
ID: 261572 • Letter: Q
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Question 3 (8 pts). Before a drought arrives in the environment, a population of frogs is in Hardy-Weinberg equilibrium and has a gene that encode for leg length called F, with allele "F" coding for long leg and "f" coding for short leg. Allele frequencies before the drought are: frequency of "F" 0.7 and frequency of "P 0.3. Fitness is measured for each genotype and determined as: fitness of FF 1, fitness of Ff 0.4 and fitness of ff What is the frequency of the "f" allele, one generation after the drought arrived in the environment?Explanation / Answer
The frequency of F = 0.7,
the frequency of f = 0.3.
FF
Ff
Ff
Genotype frequencies
0.7*0.7 = 0.49
2*0.7*0.3 = 0.42
0.3*0.3 = 0.09
Fitness
1
0.4
0.6
The genotype frequencies after fitness (frequencies * fitness)
0.49*1=0.49
0.42*0.4=0.168
0.09*0.6=0.054
The allele frequencies after fitness
Genotype
Freequency
Allele F
Allele f
Total
FF
0.49
0.98
0
0.98
Ff
0.168
0.168
0.168
0.336
ff
0.054
0
0.108
0.108
Total
0.712
1.148
0.276
1.424
Allele F
= 1.148/1.424
0.81
Allele f
= 0.276/1.424
0.19
F = 0.81; f = 0.19
FF
Ff
Ff
Genotype frequencies
0.7*0.7 = 0.49
2*0.7*0.3 = 0.42
0.3*0.3 = 0.09
Fitness
1
0.4
0.6
The genotype frequencies after fitness (frequencies * fitness)
0.49*1=0.49
0.42*0.4=0.168
0.09*0.6=0.054
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