Biological Science (7th Edition)
7th Edition
ISBN: 9780134678320
Author: Scott Freeman, Kim Quillin, Lizabeth Allison, Michael Black, Greg Podgorski, Emily Taylor, Jeff Carmichael
Publisher: PEARSON
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Chapter 23, Problem 12PIAT
QUANTITATIVE Toucans can eat fruits with large seeds because their large bills can open very wide. Most other birds in the same forest can only eat small seeds. Ecologist Mauro Galetti and his colleagues measured the seed sizes of palms in forest fragments with and without toucans. The graphs show two of the forest populations they studied. What is the take-home message of the data?
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Use the key info from the previous slide to make a prediction about the finches
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the finches eat the seeds of many of these plants, the
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that were available. Most seed-eating finches prefer to
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You've been out in the field collecting data on the predation of holly leaves. You collect 200 leaves in total of which 100 leaves contain one mine, 20 leaves contain 2 mines and 30 leaves contain 3 mines. After close examination with your hand lens and dissecting microscope you categorize a total of 15 mines with round holes, 9 mines that were torn open and 27 mines with an irregular hole. After some basic analyses you conclude that the predation rates by blue tits and wasps are:
A.
3.7% and 6.5%
B.
6% and 10%
C.
10% and 6%
D.
4% and 6.5%
In 1929, 13 white-tailed deer were introduced to an isolated island with no natural predators. A survey was conducted once a year to estimate the population of deer on the island. The table shows the deer population over the first five years on the island. The deer fed on many of the native plants found on the island, including the California false indigo, a thornless shrub that is a preferred food source on the island for deer. Based on the data, which of the following graphs correctly predicts the population of California false indigo from 1929 to 1941?
Year of Survey
Population of Deer
1929
13
1932
29
1935
66
1938
157
1941
398
image 1 because the California false indigo will be able to reproduce faster than it can be consumed by the deer and will be unaffected by the deer population, maintaining its current population
image 2 because the increasing number of deer will help spread seeds of the plant and lead to a rise in…
Chapter 23 Solutions
Biological Science (7th Edition)
Ch. 23 - PROCESS OF SCIENCE In what sense is the...Ch. 23 - 2. Why isn’t inbreeding considered an evolutionary...Ch. 23 - 4. True or false? Gene flow can either increase or...Ch. 23 - 6. In the 1700s and 1800s, royalty in Europe often...Ch. 23 - MODEL Draw a small concept map (BioSkllls 12 )...Ch. 23 - 9. QUANTITATIVE In humans, albinism is caused by...Ch. 23 - Prob. 10TYPSSCh. 23 - Are toucans important to tropical forests? Human...Ch. 23 - QUANTITATIVE Toucans can eat fruits with large...Ch. 23 - 13. Do these data illustrate directional,...
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- Mclver beetles come in three colors: black, white, and brown. They are consumed by the Foust finch. To avoid predators, the beetles hide on the bark of trees in their environments. If the number of trees with black bark was significantly greater than the number of trees with white or brown bark, what would be the effect on the predation of Mclver beetles by the Foust finches? Far fewer black beetles would I + Which of the five conditions of Hardy-Weinberg equilibrium would be violated in this situation? V [ Select ] Genes are now mutating. Mating is no longer random. The population size is now much larger. The population would experience natural selection pressures. There is now immigration of individuals into the population.arrow_forwardThe large and heavy seeds of the limber pine (Pinus flexilis) lack the wings on seeds characteristic of most pines. The seeds are the primary food source for Clark’s nutcracker which harvests seeds after the cones open. It then caches thousands of seeds each summer and fall in locations far from the original tree to eat later in the year. During years when many cones and seeds are produced, the nutcracker caches 3-5x the number of seeds actually eaten. When they are present, tree squirrels remove the cone before it opens before the seeds are fully developed, and will eat the seeds immediately or cache the cone for later consumption. Question: Scientists were interested to see whether the two seed harvesters would affect seed and cone traits. They compared cone and seed traits in areas that had nutcrackers but tree squirrels were either present or absent. Where squirrels were present, cone mass was larger but there were fewer seeds per cone, and smaller kernels per seed. What do the…arrow_forwardConsider two bird species that forage for insects that live in shrubs. The shrubs have a clumped, patchy distribution throughout their habitat. The two bird species have the same ability to locate, capture, and consume the insects. However, one species (species A) uses less energy to fly from patch to patch than the other species (species B). According to the marginal value theorem, which bird species should spend more time in each patch, and why?arrow_forward
- An alpine wildflower species varies in flower color. There are red-flowered plants (RR), red and white-flowered plants (RW) and white-flowered plants (WW) in population. Initially, the genotype frequencies are red RR= 0.35, red/white RW=0.34. and white WW=.31 Flower color affects reproduction success because it influences pollinator behavior. After a new pollinator colonizes the meadow where this wildflower lives, the average number of offspring per plant is red=105, red/white= 89, white =96 What will be the genotype frequencies in the first generation of plants following natural selection due to the new pollinator? Round all values to 2 decimal places In the rationale, explain how you arrived at the answer A. RR=.71 RW=.07 WW=.22 B. RR=.34 RW=.60 WW=.06 C.RR=.68 RW=.23 WW=.09 D. RR=.45 RW=.52 WW=.03 E RR=.38 WW=.31 WW=.31 F. RR=.35RW=.34 WW=.31 Rationale:_______________________________________arrow_forwardAfrican elephants are threatened by poachers, who kill the elephants for their tusks. Both male and female elephants can grow tusks. There are some elephants that are tuskless (do not grow tusks). In the elephant population of Gorongosa National Park, the number of female elephants was monitored for many years. The graphs show the total female elephant population and the percent of tuskless females in that population from 1970 to 2015. Which of the following describes the trend in the female elephant population from 1970 to 1995 ? The overall population decreased, and the proportion without tusks increased. Answer A: The overall population decreased, and the proportion without tusks increased. A The overall population decreased, and the proportion without tusks decreased. Answer B: The overall population decreased, and the proportion without tusks decreased. B The overall population increased and then decreased, and the proportion without tusks…arrow_forwardReview the following figure, and then answer the two questions that follow. a)Given that beak size in mature adults does not change, what factor is driving the change in average beak size in Galápagos finches over time? Seed number Seed size Rainfall amounts Both b. and c. All of the above. b)What would you predict about beak size if the Galápagos experiences a wet year? More birds with small beaks will survive More birds with large beaks will survive Both a. and b. All of the abovearrow_forward
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