Campbell Essential Biology (7th Edition)
7th Edition
ISBN: 9780134765037
Author: Eric J. Simon, Jean L. Dickey, Jane B. Reece
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 13, Problem 14PS
Imagine that the presence or absence of stripes or the snails from the previous question is determined by a single gene locus, with the dominant allele (S) producing striped snails and the recessive allele (s) producing unstriped snails Combining the data from both the living snails and broken shells, calculate the following: the frequency of the dominant allele, the frequency of the recessive allele, and the number of heterozygotes in the observed groups.
| Striped Shells | Unstriped Shells | |
| Number of live snails | 264 | 296 |
| Number of broken snail shells | 486 | 377 |
| Total | 750 | 673 |
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Consider this scenario following several generations of frogs and then answer the following question. True or False: Evolution occurred between generation 1 and 2.
Generation 1 allele frequencies are G = 0.5 and g = 0.5
Generation 2 allele frequencies are G = 0.5 and g = 0.5
Generation 3 allele frequencies are G = 0.7 and g = 0.3
Consider this scenario following several generations of frogs and then answer the following question. True or False: Evolution occurred between generation 1 and 2.
Generation 1 allele frequencies are G = 0.5 and g = 0.5
Generation 2 allele frequencies are G = 0.5 and g = 0.5
Generation 3 allele frequencies are G = 0.7 and g = 0.3
False - evolution did NOT occur between generation 1 and 2.
True - evolution DID occur between generation 1 and 2.
Refer to the figure above. In their investigation of natural selection on Mc1r alleles (the gene that determines coat color) in Arizona pocket mice, Hoekstra et al. determined the frequency of the D and d alleles in each population. They also determined the frequency of alleles for two neutral mitochondrial DNA genes (genes that do not affect and are not linked to coat color). Why did the researchers include the mitochondrial DNA genes as part of their experimental design?
Allele change for the neutral mitochondrial genes serves as an experimental group and gives information on any general background genetic difference among these populations.
Allele change for the neutral mitochondrial genes serves as a control and determines coat-color differences among these populations.
Allele change for the neutral mitochondrial genes serves as an experimental group and gives information on coat-color differences among these populations.
Allele…
In a certain population of frogs, 120 are green, 60 are brownish green, and 20 are brown. The allele for brown is denoted GB, and the allele for green is designated GG. These two alleles are incompletely dominant to each other.
If this population were in Hardy-Weinberg equilibrium, how many green frogs would you expect to observe? (Remember to multiply the expected frequency by the number of frogs in the population.)
Chapter 13 Solutions
Campbell Essential Biology (7th Edition)
Ch. 13 - Place these levels of classification in order from...Ch. 13 - Which of the following is a true statement about...Ch. 13 - How did the insights of Lyell and other geologists...Ch. 13 - In a population with two alleles for a particular...Ch. 13 - Define fitness from an evolutionary perspective.Ch. 13 - Prob. 6SQCh. 13 - As a mechanism of evolution, natural selection can...Ch. 13 - Prob. 8SQCh. 13 - In a particular bird species, individuis with...Ch. 13 - Prob. 10IMT
Ch. 13 - Prob. 11IMTCh. 13 - For each statement, identify which major theme is...Ch. 13 - Interpreting Data A population of snails has...Ch. 13 - Imagine that the presence or absence of stripes or...Ch. 13 - To what extent are people in a technological...Ch. 13 - What plants and animals have you seen near your...
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
- How Can We Measure Allele Frequencies in Populations? In a population where the females have the allelic frequencies A = 0.35 and a = 0.65 and the frequencies for males are A = 0.1 and a = 0.9, how many generations will it take to reach HardyWeinberg equilibrium for both the allelic and the genotypic frequencies? Assume random mating and show the allelic and genotypic frequencies for each generation.arrow_forwardCalculate all the frequencies and summarize them in the attached table. Then use the data to answer the questions below: Which of the following best describes the change in kdr genotype frequencies over time in A. gambiae? Choice 1 of 4:From pre-2006 to post-2006, the frequency of the r/r genotype increased slightly while the frequencies of +/+ and +/r genotypes decreased dramatically. Choice 2 of 4:From pre-2006 to post-2006, the frequency of the r/r genotype increased dramatically while the frequencies of +/+ and +/r genotypes decreased dramatically. Choice 3 of 4:From pre-2006 to post-2006, the frequency of the r/r genotype increased dramatically while the frequencies of +/+ and +/r genotypes remained relatively constant. Choice 4 of 4:From pre-2006 to post-2006, there was little change to the r/r, +/+, and +/r genotype frequencies Which of the following best describes the change in kdr genotype frequencies over time in A. coluzzii? Choice 1 of 4:From…arrow_forwardFor the autosomal recessive condition cystic fibrosis, affected individuals in the African-American population are found at a frequency of 1/17,000. Assuming Hardy-Weinberg equilibrium conditions and no advantage or disadvantage of heterozygotes what is the frequency with which carriers are present in the African-American population? How are your calculations and explanations regarding frequencies in next generation.arrow_forward
- An hypothesis for the extinction of the dinosaurs is that the earth had been hit by a gigantic meteor that caused the death of those big reptiles. In that case the entire genetic pool of those animals has been destroyed, invalidating the Hardy-Weinberg equilibrium. In Genetics what is this type of gene frequency change called?arrow_forwardA researcher is studying two fly populations. Population A have stubbly bristles that are shorter and blunter than population B and are ebony coloured with black bodies. This is because they are homozygous for a certain allele for the stubble gene which affects bristle length and homozygous for the ebony gene which affects body colour. Population B have longer tapered bristles than population A and are not stubbly in appearance. They are not ebony and have brown bodies. This is because they are homozygous for a different gene that affects bristle length to population A and are homozygous for the gene that affects body colour. Table 1: F1 ebony flies - 0 F1 non-ebony flies - 560 F1 stubble flies - 560 F1 non-stubble flies - 0 Draw two separate Punnett Squares to illustrate the P1 cross - one for the stubbly alleles and one for the ebony alleles showing the individual gametes of each parent and the combination in the resulting F1 offspring.arrow_forwardConsider the following hypothetical scenario involving giraffes. A population of giraffes is composed of individuals of varying neck lengths, i.e., some giraffes have long necks, others have short necks, and some are in-between. Neck length in giraffes is a heritable trait, i.e., offspring have necks similar to their parents due to them inheriting genes from their parents. Within this population, there is competition for resources (leaves to eat). Long-necked giraffes are able to consume more leaves than short or medium-necked giraffes because they can reach leaves that are higher up in the canopy. Therefore, long-necked giraffes, in the current generation, have begun to survive and reproduce more often than giraffes with short or medium necks. https://www.globalchange.umich.edu/globalchange1/current/lectures/selection/selection.html (you can also search “natural selection Michigan” to find this helpful website) If you read between the lines…the above paragraph tells…arrow_forward
- If you observe a selection coefficient of 0.025 against recessive homozygotes, what is the relative fitness of these recessive homozygotes? (please give your answer to three decimal places)arrow_forwardThe following table provides phenotypic data for a population of mammoths living in cold environments based on fossil and DNA evidence. Based on this data and your knowledge of natural selection, which explanation best explains the trends seen in the data? Individuals with thicker fur had a survival advantage in the cold environment, allowing these individuals to reproduce more often and create more offspring. Individuals within this population of mammoths tend to only mate with individuals that have thick fur. This population of mammoths appear to be in Hardy-Weinberg equilibrium since no allele frequencies are changing over time. Individuals with thick fur migrated into the population of mammoths, increasing the proportion of these individuals.arrow_forwardThe trait that natural selection “selects for” is lifetime Darwinian fitness. If relative matching of the moths to the background is determining fitness differences, is there any difference in other fitness components in the color morphs of Biston betularia that is influencing the direction of evolution in the three populations shown in the graph?arrow_forward
- Clines in body size have been observed in many species, such as the latitudinal cline in moose shown in Figure 8.2 (shown in the previous question). How might you determine whether a cline in body size was caused by clines in allele frequencies? Which of the following is NOT one of the strategies to test this? Group of answer choices A.) Measure and assess the morphological character in multiple individuals along the cline and statistically compare them for significant differences. B.) Swap individuals or seeds from one end of the cline with those at the other end of the cline, and vice-versa, and then measure and assess how they grow. C.) Grow or raise individuals from different parts of the cline under the same conditions, in a common garden experiment, and then measure and assess how they grow. D.) Identify the genes coding for that morphological character, sequence them in multiple individuals across the cline, and then compare them for variation in sequence, structure,…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_forwardUnder the above conditions of reproductive discrimination against those with attached earlobes, if the population in this next generation is still 500,000 people, then the new genotypic frequencies will be: Homozygous dominants, unattached ear lobes: 0.34 Heterozygotes, unattached ear lobes: 0.48 Homozygous recessives, attached ear lobes: 0.18 What will be the allele frequencies for L and l in this generation? Did the frequency of the recessive allele (l), as compared to its frequency calculated in Part B, increase or decrease because of its deleterious effects on fitness? Does the possession of the recessive allele kill those who possess it? If those with attached ear lobes continue to be only half as successful in securing mates in each successive generation, what will happen to the frequency of the recessive allele in this population?arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Biology: The Dynamic Science (MindTap Course List)BiologyISBN:9781305389892Author:Peter J. Russell, Paul E. Hertz, Beverly McMillanPublisher:Cengage Learning
Human Heredity: Principles and Issues (MindTap Co...BiologyISBN:9781305251052Author:Michael CummingsPublisher:Cengage Learning
Biology: The Dynamic Science (MindTap Course List)
Biology
ISBN:9781305389892
Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher:Cengage Learning
Human Heredity: Principles and Issues (MindTap Co...
Biology
ISBN:9781305251052
Author:Michael Cummings
Publisher:Cengage Learning
How to solve genetics probability problems; Author: Shomu's Biology;https://www.youtube.com/watch?v=R0yjfb1ooUs;License: Standard YouTube License, CC-BY
Beyond Mendelian Genetics: Complex Patterns of Inheritance; Author: Professor Dave Explains;https://www.youtube.com/watch?v=-EmvmBuK-B8;License: Standard YouTube License, CC-BY