Concept explainers
To determine: Whether polymorphism will persists or one allele will become fixed if the fecundity values with 50, 55, 70 in spring generation and 70, 65, 55 in the fall generation remain unchanged for many years.
Introduction: Polymorphism is the existence of a species population, in more than one form. Different forms of the organisms in a population are formed from same type of genotype. Polymorphism is transmitted to the progenies and is evolved by natural selection.
To determine: The impact of fecundity values on polymorphism, when the fecundity values are changes to 55, 65, 75 in spring generation and 75, 65, 55 in the fall generation.
Introduction: Fecundity is the ability of an organism to reproduce, and it is measured by counting the number of gametes or eggs. Fecundity can change the population number according to the various factors.
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Check out a sample textbook solution- In a large herd of 5468 sheep, 76 animals have yellow fat, and the rest of the members of the herd have white fat. Yellow fat is inherited as a recessive trait. This herd is assumed to be in Hardy-Weinberg equilibrium. A. What are the frequencies of the white and yellow fat alleles in this population? B. Approximately how many sheep with white fat are heterozygous carriers of the yellow allele?arrow_forwardSuppose a population has two alleles at a particular locus, and individuals with different diploid genotypes at this locus have different probabilities of survival and expected offspring, as given in the table below: Genotype % Surviving to adulthood Expected offspring GG 90% 11 Gg 80% 15 gg 50% 28 Calculate the absolute fitness, W, for each genotype, and then the relative fitness, w, using the smallest absolute fitness value as your reference. Assume that the selection differential s is equal to the difference in relative finesses of the heterozygote, Gg, genotype, and the least-fit genotype. If there are 311 individuals who are homozygous for the G allele in a population of 4,659, and we ignore the effect of genetic drift, how much should the frequency of the G allele change over one generation of natural selection? (Give your answer up to four decimal places).arrow_forwardAssume that the frequency of gene B in a hypothetical population Is 0.63, that there are only two alleles (B and b) of the gee in the population, that allele B is dominant over allele b, that neither allele has a selective advantage over the other, and that the population is at equilibrium with regard to this particular gene. What proportion of the population is expected to have the phenotype specified by the B allele according to the Hardy-Weinberg formula? 0.47 0.87 0.67 0.40 0.37arrow_forward
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- A population consists of 300 individuals with the following genotypes: AA – 100 Aa – 125 aa – 75 For the population in the problem above, imagine that the homozygous recessives are deleterious and that only 80% of these individuals survive to reproduce. If the other genotypes have a 100 % survival rate, and in each surviving individual replaces itself through reproduction, what are the values of p and q after one generation?arrow_forwardSuppose that a population is at equilibrium between mutation and selection for a deleterious recessive allele, where s = 0.5 and μ = 10−5. What is the equilibrium frequency of the allele? What is the selection cost?arrow_forwarda study to assess the strength of selection on alleles of a gene “B” which affects brightness of the bioluminescence in fireflies. Fireflies with the brightest light (genotype BB), have an average of 5 offspring. Fireflies with the dimmest light (genotype bb), have an average of 20 offspring. Fireflies with an intermediately bright light (genotype Bb), have an average of 25 offspring. What is the fitness of… BB = Bb = bb = For which genotype would selection be strongest?arrow_forward
- Consider the first copy of an allele for insecticideresistance that arises by mutation in a populationof insects exposed to an insecticide. Is this mutation an adaptation? If, after some generations,we find that most of the population is resistant,is the resistance an adaptation? If we discovergenetic variation for insecticide resistance in apopulation that has had no experience of insecticides, is the variation an adaptation? If an insectpopulation is polymorphic for two alleles, eachof which confers resistance against one of twopesticides that are alternately applied, is thevariation an adaptation? Or is each of the tworesistance traits an adaptation?arrow_forwardA different locus codes for drought tolerance in desert tortoises. On average during a drought, genotype AA produces 7 offspring, genotype AB produces 8 offspring, and genotype BB produces 3 offspring. The genotype frequencies in 2019 are 10% AA, 10% AB, and 80% BB. What is the expected equilibrium allele frequency p* after a large number of generations go by during the drought? Assume the tortoise population is also very large.arrow_forwardRecall that the Hardy-Weinberg model makes the following assumptions: No mutations Extremely large population No gene flow No selection You score flower colour in a very large natural population where flower colour is a co-dominant trait where white and red are homozygotes (CWCW and CRCR) and pink are heterozygotes (CWCR). Taking your observed phenotypes and genotypes, you apply the Hardy-Weinberg principle and find an excess of homozygous individuals (that is, individuals with either white or red flowers). Give two plausible explanations for this excess of homozygotes in the natural population.arrow_forward
- Human Heredity: Principles and Issues (MindTap Co...BiologyISBN:9781305251052Author:Michael CummingsPublisher:Cengage Learning