22. When investigating the shell color of a species of snail found only in a remote area seldom visited by humans, scientists discovered the distribution of snails shown in the graph to the right. Based on the graph, which type of natural selection is the snail population undergoing? A. Directional selection B. Disruptive selection CAStabilizing selection ulation of finches in which one subset of birds has a short, dark Number of Individuals light Coloration

22. When investigating the shell color of a species of snail found only in a remote area seldom visited by humans, scientists discovered the distribution of snails shown in the graph to the right. Based on the graph, which type of natural selection is the snail population undergoing? A. Directional selection B. Disruptive selection CAStabilizing selection ulation of finches in which one subset of birds has a short, dark Number of Individuals light Coloration

Name: 23 4 of 770%series of years. Which of the following is the best possib
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Description: 23 4 of 770%series of years. Which of the following is the best possible explanation for the change in the data?A. Forest fires wiped out the prefered habitat of the light-colored mothsB. Light-colored moths decreased due to a disease specific to the

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter20: Development Of Evolutionary Thinking

Section: Chapter Questions

Problem 1ITD: For centuries, animal breeders have used artificial selection to increase the speed of racehorses....

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a 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?
ocesses/Se are the same se two trees are NOT the same At some point in the past, foxes arrived in the Arctic (far northern latitudes) and we able to establish a population. Now, there is a white population of foxes that lives there. Which of the following was the primary change that occurred gradually over time in the Arctic fox population, eventually resulting in foxes with white fur? O The fur color of each individual fox within the population gradually changed. O The frequencies of foxes with different fur colors within the population changed. O Mutations occurred to meet the need of the fox population in the new environment. O Foxes that survived longest gained white fur in their old age, which they passed on to their offspring, tion 15
Amount of NH3 nces ne In a population of pansies, the red allele (CR) is incompletely dominant to the white allele (Cw). If the frequency of the red allele is 80%, what is the frequency of pink flowers in the population?* ds 1 and 2 20% Highschool MP3, 0.20 0.80 0.32 Fri O 0.16 When Charles Darwin visited the Galapagos Islands, he observed the marine OOO
Please answer both with explanation . Part A. Compared with other factors that can alter allele frequencies, mutation rates. a. are low, but mutations are the source of genetic variability. b. are so low that they make no difference in nature. c. are less important than genetic drift, but more important than migration. d. are the most significant factor in microevolution. e. are so low that they cannot be detected in most populations. Part B. If a gene is described as polymorphic, how many alleles does it have? a. one . b. two . c. two or more. d . more than three . e. none of the above .
The pesticide DDT was widely used in the 1940s as a method of insect control. In the late 1950s the first DDT-resistant mosquitoes were discovered, and eventually DDT-resistant mosquitoes were found globally. When DDT is used now, the development of DDT resistance in mosquito populations occurs in months rather than years.Which of the following best explains the observations concerning DDT resistance in mosquitoes? * nd 2 school The proportion of DDT-resistant mosquitoes in a population remains constant due to the metabolic costs of DDT utilization DDT is a chemical signal that delays normal reproductive cycles in many mosquito populations. Natural selection favors DDT-resistant mosquitoes that are already present in a population when DDT exposure occurs. Competition for limited resources causes mosquitoes to migrate to geographical areas that have richer supplies of DDT. A population of 1.492 finches is introduced to a rainforest. Over the next year, the finches showa death rate of…
n= 100 birds 92% 8% In the above hypothetical population of a bird species, what is the frequency of b alleles in the population? 28% 8% 40% O 16%
WRITE DOWN SOME NOTES OR TAKE AWAYS ABOUT THIS MODEL. Model 3 – Random Genetic Drift This model is an adaptation of the classic experiment conducted by Peter Buri (1956), which documented genetic drift in laboratory populations of Drosophila. In the model, ten vials (populations) of flies are held at a constant population size and the proportions of a mutant allele are tracked over generations. The population size and the initial allele proportion can be manipulated.
Population and Community Dynamics Unit D: Assignment 8A In garden pea plants, the yellow seed colour (Y) is dominant over the green seed colour (y). 3. In a population of 24 pea plants, 15 pea plants are homozygous dominant, 6 are heterozygous dominant, and 3 are recessive. Find the frequency of the following. Show all work and record your response using three significant digits. a. YY genotype: b. Yy genotype: c. yy genotype:
Lab Data Environment: Polluted Forest Typica Carbonaria Total Typica Carbonaria Moths Released q P Phenotype Frequency Allele Frequency 2pq p² 250 Moths 750 1000 Typica Carbonaria Carbonaria Allele Genotype Frequency d D dd Dd Color Genotype DD Light Dark G₁ 125 510 635 Color Light Dark Dark G₂ 88 735 823 Initial Frequency 0.50 Initial Allele Frequency 0.50 Moths Released 250 500 0.25 250 0.75 G3 83 885 968 Initial Frequency 0.25 0.50 0.25 G4 76 1042 1118 G5 29 1406 1435 Frequency G5 G5 Allele Frequency Frequency G5 Number of Moths G5
In our lectures, the antagonistic pleiotropy hypothesis is used to explain why evolving to live longer is often beneficial to oneâ s fitness. True False
12. The fitness for a particular species of bats is determined by a single gene locus with two segregating alleles, (E) and (e), that determines echo-location ability. The dominant allele E causes normal echo-location, whereas the recessive allele e impairs echo-location ability. You are studying a large population and determine initial frequencies of the E and e alleles to be 0.7 (p) and 0.3 (q), respectively. Assume genotypes are in Hardy-Weinberg equilibrium. Given the following average offspring numbers, determine the effects of natural selection on the allele frequencies after one generation (what are the new frequencies of p and q?). Genotype Average # Offspring EE 10 Ee 10 ee 6. 5. Genes A B an hiognthotic nathwaye!
I. A population called the founder generation, consisting of 2000 AA individuals, 2000 Aa individuals, and6000 aa individuals is established on a remote island.Mating within this population occurs at random, thethree genotypes are selectively neutral, and mutationsoccur at a negligible rate.a. What are the frequencies of alleles A and a in thefounder generation?b. Is the founder generation at Hardy-Weinbergequilibrium?c. What is the frequency of the A allele in the secondgeneration (that is, the generation subsequent to thefounder generation)?d. What are the frequencies for the AA, Aa, and aagenotypes in the second generation?e. Is the second generation at Hardy-Weinbergequilibrium?f. What are the frequencies for the AA, Aa, and aagenotypes in the third generation?