Campbell Biology (10th Edition)
10th Edition
ISBN: 9780321775658
Author: Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Question
Chapter 23, Problem 5TYU
Summary Introduction
Introduction: A population is in Hardy-Weinberg equilibrium where the allele and genotype frequencies remain constant over generations. Hardy-Weinberg equilibrium follows the given equation, p2 + 2pq + q2 = 1, where, p2 represents the dominant homozygous genotype, q2 represents the recessive homozygous genotype and 2pq represent the heterozygous genotype.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
You are a scientist studying a population of beetles. Beetle color is controlled by two alleles at a single
genetic locus. AA beetles are blue, Aa purple, and aa pink. You count 30 blue beetles, 10 purple
beetles, and 40 pink beetles.
a) What is the frequency of the A allele? [ Select ]
b) What is the observed frequency of the Aa genotype? 1 Select ]
c) Under Hardy-Weinberg equilibrium, what is the expected frequency of the aa gentoype?
[ Select ]
d) Is this beetle population evolving? I Select ]
You have collected and determined genotypes of 200 individuals from a population of thr fruit fly, Drosophila pseudoobscura. Your sequencing study revealed 20 individuals with genotype AA, 70 individuals with genotype Aa and 110 individuals with genotype aa.
i) what are your theoretical expectations for the number of individuals with each genotype if the population is in Hardy-Weinberg equilibrium.
ii) Based on the genotype counts observed, is there evidence that this population of fruit flies deviates from your theoretical expectations under Hardy-Weinberg equilibrium?
1a) In a population of 800 squirrels, the gene for white paws is recessive to the dominant allele which codes for brown paws. There are 200 squirrels that have white paws in the population. How many squirrels in the population are homozygous dominant for this allele? Assume that the population is in H.W. equilibrium for this allele.
1b) In a population of dandelions the frequency of the recessive allele that codes for long petals is .2 (20%). What proportion of the population is homozygous for the recessive allele? Assume the population is in Hardy Weinberg equilibrium for this allele.
Chapter 23 Solutions
Campbell Biology (10th Edition)
Ch. 23.1 - Explain why genetic Variation within a population...Ch. 23.1 - Ot all the mutations that occur in a population,...Ch. 23.1 - MAKE CONNECTIONS If a population stopped...Ch. 23.2 - A population has 700 individuals, 85 of genotype...Ch. 23.2 - The frequency of allele a is 0.45 for a population...Ch. 23.2 - WHAT IF? A locus that affects susceptibility to a...Ch. 23.3 - In what sense is natural selection more...Ch. 23.3 - Distinguish genetic draft from gene flow in terms...Ch. 23.3 - WH AT IF? Suppose two plant populations exchange...Ch. 23.4 - What is the relative fitness of a sterile mule?...
Ch. 23.4 - Explain why natural selection is the only...Ch. 23.4 - Prob. 3CCCh. 23 - Typically. most of the nucleotide variabillity...Ch. 23 - Is it circular reasoning to calculate p ond q from...Ch. 23 - Would two small, geographically isolated...Ch. 23 - How might secondary sex characteristics in males...Ch. 23 - Natural selection changes allele frequencies...Ch. 23 - Prob. 2TYUCh. 23 - Prob. 3TYUCh. 23 - There are 25 individuals in population 1, all with...Ch. 23 - Prob. 5TYUCh. 23 - EVOLUTION CONNECTION Using at least two examples,...Ch. 23 - Prob. 7TYUCh. 23 - Prob. 8TYUCh. 23 - SYNTHESI2E YOUR KNOWLEDGE This kettle lake forracd...
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- A) Explain why we use the concept of Hardy-Weinberg Equilibrium if populations are never stable? B) What do the mathematical results tell us if the allele frequencies do not match our predictions? (In other words, if you have extra spotted fish in a generation, what has happened?)arrow_forwardIn the Paraguayan Easter Atlantic Forest, a mating between a homozygous black yaguarundi and a homozygous blond yaguarundi will produce all brown yaguarundi offspring. When these brown F₁ yaguarundies are mated, their offspring consists of 2 white, 31 black, 154 brown, and 17 blond yaguarundies. A) Name what genetic interaction or ratio (depending on the ratio expected) may be occurring in this population? B) What are the observed and expec phenotypic ratios for these F2 progeny? C) Use a Chi-squared analysis to test your hypothesis (set a = 0.05). Be sure to report all values used in your comparisons (p-values, critical values, alpha value, df, etc), your hypothesis, and show your work.arrow_forward(1 point) Humans with the genotypes DD and Dd show the Rh+ blood phenotype, whereas those with the genotype dd show the Rh- blood phenotype. In a sample of 400 Basques from Spain, 230 people were Rh+ and 170 people were Rh-. Assuming that this population is in Hardy-Weinberg proportions, what is the allele frequency of the allele D? (a) (a) 0.348 (answer) (b) (b) 0.652 (c) (c) 0.425 (d) (d) 0.575 (e) (e) 0.288 2. (2 points) In the Basque population mentioned above, what proportion of the Rh+ individuals would be expected to be heterozygote? (a) (a) 0.454 (b) (b) 0.789 (answer) (c) (c) 0.516 (d) (d) 0.250 (e) (e) 0.500 How is the answer for #2, b? please explainarrow_forward
- A species of butterfly shows variation in the length of the antennae. You measure antennae in a butterfly population and find the mean to be 15 mm. You calculate a heritability of antennae length to be 1 (h2 = 1). %3D That summer, there is a severe drought. Many of the butterflies die and only a few survive to reproduce. The surviving butterflies have a mean antennae length of 17 mm. a) What is the predicted mean limb-length of the offspring of the surviving butterflies? [ Select ] b) What type of selection was acting on antennae length in these butterflies? [ Select ] c) Five years later, you go back and measure antennae length in this butterfly population again. Every butterfly in the population has antennae measuring 16 mm. What is the heritability of antennae length in this population now? [Select ]arrow_forwardIn plants, violet flower color (V) is dominant over white (v). If p = 0.8 and q = 0.2 in a population, what percentage of the flowers would you expect to be homozygous dominant (VV)? Assume this population is in Hardy-Weinberg equilibrium. a)80% b) 64% c) 32% d) 4%arrow_forwardIn fruit flies, long wings (L) are dominant over short wings (l). In a population of 45 fruit flies, 27 have LL genotypes, 13 have Ll genotypes, and 5 have ll genotypes. Find the frequency of the following. Show all work and record your answer as a value between 0 and 1 rounded to two decimal places.a. long-winged fruit flies: b. short-winged fruit flies:arrow_forward
- A population of horses in the magic land is having a problem. Individuals are not mating randomly and they are only mating with those that have the same flying speed as their own: Fast (FF), Medium speed (FS), or Slow (SS). You arrive to this magical land and count the following horses of each flying velocity: Fast = 71 Medium speed = 90 Slow = 31 If we consider these results Generation 1, what are the expected number of Medium speed individuals for each genotype in Generation 3 if we have only inbreeding, that is, FF only reproduces with FF; FS only reproduces with FS; and SS only reproduces with SS?arrow_forward2) The year is 2050. The climate has continued to warm. Areas in northern Canada and Alaska are without snow or ice; the average annual temperature has risen and previously snow-covered areas are now shrub land and some temperate forests. What effect would such a climatic change have on the gene pool of the rabbits? All BUT ONE could apply. A) The allelic frequency has most likely shifted to 85% GG and 15% gg. B) The dominant allele in the gene pool would become G, the previously rare allele. C) The allele for white, g, would be scarce and perhaps nonexistent in the population. D) White rabbits would be at a disadvantage in terms of camouflage and would likely fall prey to predators.arrow_forwardSuppose that in generation 0, the frequency of allele A1 in a population of armadillos is 0.4. In each generation, 10 percent of the individuals in that population are migrants from another population that has an allele frequency of 0.6. a) Calculate the frequency of A1 in each of the next two generations (generations 1 and 2). b) Is the change in allele frequency in generation 2 greater than, less than, or equal to the change in generation 1? How can you explain that answer? c) What will the allele frequency become in this population after many generations? I need all three parts with calculations asap!!arrow_forward
- (22) A 35- year old woman and her 35-year old husband come to the physician for genetic counselling after their son is diagnosed with a rare metabolic disease. The carrier frequency of this disorder in the general population is 1 of 100. Assuming Hardy-Weinberg equilibrum, which of the following bst represents the incidence of this condition in the general population (A) 1 of 4000 (B) 1 of 10000 (c) 1 of 16000 (D) 1 of 24000 (E) 1 of 40000arrow_forwardC1C1 C1C2 C2C2 D1D1 D1D2 D2D2 Sand 0.07 0.39 0.54 0.25 0.5 0.25 Land 0.18 0.49 0.33 0.06 0.22 0.72 Lets believe that there is an effective pop. size with 1000 individs in the population of sand. What do you predict will be the generations it will take for the C locus heterozygosity to get to the 1/2 of the recent or in other words current value?arrow_forwardA sample of 100 individuals from a population that is dimorphic at the A locus has genotype counts as follows. AA: 30 Aa: 60 aa: 10 a) What are the allele frequencies in the population? b) What are the expected genotype frequencies, if the population were at HardyWeinberg equilibrium? c) Is the proportion of heterozygotes lower or higher than expected at Hardy-Weinberg equilibrium? What deviations from the assumptions of the model would best explain the observed difference?arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Human Anatomy & Physiology (11th Edition)BiologyISBN:9780134580999Author:Elaine N. Marieb, Katja N. HoehnPublisher:PEARSON
Biology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStax
Anatomy & PhysiologyBiologyISBN:9781259398629Author:McKinley, Michael P., O'loughlin, Valerie Dean, Bidle, Theresa StouterPublisher:Mcgraw Hill Education,
Molecular Biology of the Cell (Sixth Edition)BiologyISBN:9780815344322Author:Bruce Alberts, Alexander D. Johnson, Julian Lewis, David Morgan, Martin Raff, Keith Roberts, Peter WalterPublisher:W. W. Norton & Company
Laboratory Manual For Human Anatomy & PhysiologyBiologyISBN:9781260159363Author:Martin, Terry R., Prentice-craver, CynthiaPublisher:McGraw-Hill Publishing Co.
Inquiry Into Life (16th Edition)BiologyISBN:9781260231700Author:Sylvia S. Mader, Michael WindelspechtPublisher:McGraw Hill Education
Human Anatomy & Physiology (11th Edition)
Biology
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:PEARSON
Biology 2e
Biology
ISBN:9781947172517
Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:OpenStax
Anatomy & Physiology
Biology
ISBN:9781259398629
Author:McKinley, Michael P., O'loughlin, Valerie Dean, Bidle, Theresa Stouter
Publisher:Mcgraw Hill Education,
Molecular Biology of the Cell (Sixth Edition)
Biology
ISBN:9780815344322
Author:Bruce Alberts, Alexander D. Johnson, Julian Lewis, David Morgan, Martin Raff, Keith Roberts, Peter Walter
Publisher:W. W. Norton & Company
Laboratory Manual For Human Anatomy & Physiology
Biology
ISBN:9781260159363
Author:Martin, Terry R., Prentice-craver, Cynthia
Publisher:McGraw-Hill Publishing Co.
Inquiry Into Life (16th Edition)
Biology
ISBN:9781260231700
Author:Sylvia S. Mader, Michael Windelspecht
Publisher:McGraw Hill Education
What is Evolution?; Author: Stated Clearly;https://www.youtube.com/watch?v=GhHOjC4oxh8;License: Standard Youtube License