Question

In: Biology

In a population of mealybugs the dominant allele (G) frequency for an allele controlling fluffiness is...

In a population of mealybugs the dominant allele (G) frequency for an allele controlling fluffiness is 0.75. Selection is acting upon this locus such that the fitness values are gg=0.4, Gg=1, and GG=0.027. Simulate selection in the population by calculating gentoype frequencies following selection, and calculating allele frequencies from those genotype frequencies.

a. State which genotype is being favored by selection.

b. Give the normalized/corrected genotype frequency for gg following selection. Round your answer to the nearest thousandth (e.g., 0.123)

c. Give the allele frequency for G following selection. Round your answer to the nearest thousandth (e.g., 0.123)

Solutions

Expert Solution

a) Gg genotype is favored by selection as it has highest fitness (1) compared to other genotypes.

b) Given, frequency of G = 0.75, fitness of gg = 0.4, Gg = 1 & GG = 0.027

So, frequency of g = 1 - frequency of G = 1 - 0.75 = 0.25

So, frequency of GG = (frequency of G)2 = (0.75)2 = 0.5625

So, frequency of Gg = 2 x frequency of G x frequency of g = 2 x 0.75 x 0.25 = 0.375

So, frequency of gg = (frequency of g)2 = (0.25)2 = 0.0625

Now, mean fitness = (Frequency of GG x Fitness of GG) + (Frequency of Gg x Fitness of Gg) + (Frequency of gg x Fitness of gg) = (0.5625 x 0.027) + (0.375 x 1) + (0.0625 x 0.4) = 0.0152 + 0.375 + 0.025 (Up to 4 decimals) = 0.4152

So, after selection frequency of gg = (Frequency of gg x Fitness of gg) / mean fitness = 0.025 / 0.4152 = 0.0602 (Up to 4 decimals) = 0.060 (Up to 3 decimals)

c) Now, after selection frequency of GG = (Frequency of GG x Fitness of GG) / mean fitness = 0.0152 / 0.4152 = 0.0366 (Up to 4 decimals)

Now, after selection frequency of Gg = (Frequency of Gg x Fitness of Gg) / mean fitness = 0.375 / 0.4152 = 0.9032 (Up to 4 decimals)

So, frequency of G after selection = 1/2 of frequency of Gg + Frequency of GG = 1/2 x 0.9032 + 0.0366 = 0.4882 0.488 (Up to 3 decimals)


Related Solutions

Allele frequency is the relative frequency of a certain allele type among a certain population. Suppose...
Allele frequency is the relative frequency of a certain allele type among a certain population. Suppose that within a certain area, the allele frequency of A, B and O are 0.2, 0.1, and 0.7, respectively. Suppose that when randomly picking up a person, the first allele type is independent of the second allele type regardless of the type. Calculate the following probabilities: • The probability for this person to have type O blood. • The probability for this person to...
a. Consider a population in which the frequency of allele B is p=0.7, and the frequency...
a. Consider a population in which the frequency of allele B is p=0.7, and the frequency of the allele b is q=0.3. If W BB= 1, W Bb= 0.9, and W bb= 0.8, what will be the frequency of B after one generation? b. If the allele frequency for a dominant allele is 0.84, what is the allele frequency for the recessive allele?
7) A rare dominant genetic disorder has an allele frequency of 0.00002. It is estimated to...
7) A rare dominant genetic disorder has an allele frequency of 0.00002. It is estimated to reduce the fitness of affected individuals by 50%. Under mutation-selection balance affecting a dominant, the mutation rate is predicted to be about half the equilibrium allele frequency, or 0.00001. We’ll assume this is the case here. A) What is the frequency of affected individuals? (You could calculate an exact answer, but try getting a simple approximation using the fact that homozygotes for the mutant...
an isolated population of cats are observed for their frequency in an allele for striped and...
an isolated population of cats are observed for their frequency in an allele for striped and spotted coloring as well as the actual level of heterozygosity in each population. Allele frequency for stripes is 0.62 and spots 0.38, The observed frequency of heterozygotes is 0.08 What is the inbreeding coefficient of this population? is the population undergoing inbreeding based off of the inbreeding coefficient.
The allele b occurs with a frequency of 0.6 in a population of clams. Assuming that...
The allele b occurs with a frequency of 0.6 in a population of clams. Assuming that the population has reached Hardy-Weinberg equilibrium, the frequency of the genotype Bb is
In the Jubjub bird, the gene G controls feather color. The dominant allele G gives rise...
In the Jubjub bird, the gene G controls feather color. The dominant allele G gives rise to black pigmentation, and the recessive allele g gives rise to a pale gray color when homozyous. The gene D regulates size. The dominant allele D gives rise to giant jubjubs with wingspans over 5 meters, and dwarfism, with wingspans averaging 3 meters, is recessive. The ability to talk is also recessive. The dominant allele of the T locus results in mute birds. A...
Question 8 The allele frequency of R is 0.8 and r is 0.2. If the population...
Question 8 The allele frequency of R is 0.8 and r is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of heterozygotes? a. 0.32 b. 0.26 c. 0.16 d. 0.48 Question 9 The transfer of an antibiotic resistant gene from one bacterial species to a different species is and example of A. genetic drift B. exon shuffling C. migration D. horizontal gene transfer Question 10 The allele frequencies for a population are A = 0.6 and...
Calculation of Allele frequency
The ability of certain people to taste a chemical PTC is governed by a dominant allele T, and the inability to taste PTC by its recessive allelic t. If 24% of a population is homoxygous taster and 40% is heterozygous taster, what is the frequency of t?
In elephants, the allele for the prehensile trunk, T is dominant over the allele for a...
In elephants, the allele for the prehensile trunk, T is dominant over the allele for a non-grasping trunk, t; the allele for floppy ears, E is dominant over the allele for pointy ears, e; and the allele for pointy tusks, P is dominant over the allele for blunt tusks. If you were to cross a trihybrid elephant with a pure-breeding elephant with a prehensile trunk, pointy ears, and blunt tusks, what proportion of the offspring would have a genotype of...
a) A population of horses has an allele frequency of F(A)=0.08 and F(a)=0.2. The relative fitness of the population is 0.616.
  a) A population of horses has an allele frequency of F(A)=0.08 and F(a)=0.2. The relative fitness of the population is 0.616. If sAA=0.4 sAa=0.4 saa=0. what is the expected allele frequency of aa homozygote in next generation? b) A zoologist is studying a new species that finds the allele frequency is F(F)=0.58 and F(f)=0.42 if w11=w12=.78 and w22=1 what is Deltap?
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT