BROOKER BIOLOGY
5th Edition
ISBN: 9781307656152
Author: BROOKER
Publisher: MCG/CREATE
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Chapter 23, Problem 6TY
Summary Introduction
Introduction: In 1998, Ole Seehausen and Jacques Van Alphen performed a series of experiments for investigating the possible role of sexual selection in the population of fish. The fish possessed very complex behavior and the female fish choose their mates on the basis of the colour of male fish. In a population of fish, varied types of body colors were found which ranged from a very light shade of white to a dark shade of green.
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Some females seem to prefer the green colouration and some females seem to prefer the blue colouration. What type of selection is this an example of?
a. stabilizing
b. balancing
c. directional
d. diversifying
Predators are more likely to
a. increase the gene pool of the prey population
b. increase their population size after the prey population increases
c. lead to competition exclusion through natural selection
d. diversify the alleles of both the prey and predator populations
In many bird species, sex is preceded by a courtship dance. If a male’s dance is unrecognized by the female, she will not mate with him. This is an example of______ . a. sexual selection c. reproductive isolation b. behavioral isolation d. all of the above
Chapter 23 Solutions
BROOKER BIOLOGY
Ch. 23.1 - Prob. 1CSCh. 23.2 - Prob. 1CCCh. 23.2 - Prob. 2CCCh. 23.2 - Prob. 3CCCh. 23.3 - Prob. 1CCCh. 23.3 - Prob. 1EQCh. 23.3 - Prob. 2EQCh. 23.3 - Prob. 3EQCh. 23.4 - Genetic Drift Concept Check: How does the...Ch. 23.4 - Prob. 1CS
Ch. 23.5 - Prob. 1CCCh. 23 - Population geneticists are interested in the...Ch. 23 - The Hardy-Weinberg equation characterizes the...Ch. 23 - Prob. 3TYCh. 23 - Prob. 4TYCh. 23 - Prob. 5TYCh. 23 - Prob. 6TYCh. 23 - Prob. 7TYCh. 23 - Prob. 8TYCh. 23 - Kimuras proposal regarding neutral variation...Ch. 23 - Populations that experience inbreeding may also...Ch. 23 - Prob. 1CQCh. 23 - Prob. 2CQCh. 23 - Prob. 3CQCh. 23 - Antibiotics are commonly used to combat bacterial...Ch. 23 - Discuss die similarities and differences among...
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- Which of the following statements does not support the conclusion that giraffes are k-selected species? a. Giraffes are approximately 6’ tall and weigh 150 lbs at birth. b. Wild giraffes begin mating at 6-7 years of age. c. Newborn giraffes are capable of coordinated walking within an hour of birth, and running within 24 hours of birth. d. Giraffes rarely give birth to twins.arrow_forwardSpecies that live in unpredictable habitats are more likely to show traits that are favored by _______. a. r-selection b. K-selectionarrow_forwardIn populations subjected to high levels of predation a. individuals should invest little in reproduction so as to maximize their survival. b. individuals should produce few offspring and invest little in any of them. c. individuals should invest greatly in reproduction because their chance of surviving to another breeding season is low. d. individuals should stop reproducing altogether.arrow_forward
- Atlantic cod have experienced decades of overharvesting. As a result, the age of maturity of Atlantic cod populations have decreased, so that fish today reach sexual maturity early – at significantly smaller sizes than fish 50 years ago. From this, we can interpret that populations of Atlantic cod are experiencing. A. Directional selection B. frequency dependent Selection C. Disruptive Selection D. Genetic Drift E. Stabilizing Selection 2. In 1958, the average age to sexual maturity in the Atlantic cod population was 7.0 years. In 1959 there was a particularly large harvest of the Atlantic cod population. Fish that bred successfully that year had an average age of sexual maturity of 6.0 years. The difference between these values represents A. Mutation rate B. Selection Differential C. Response to selection D. Heritability 3. The difference in age at sexual maturity between the offspring of the fish that survived the harvest in 1959 (i.e. 6.2 years) and the population average before…arrow_forwardIntraspecific competition reduces allelic diversity by Select one: a. relieving predator pressure on the prey population b. allowing K-selected species to have a selective advantage over r-selected species c. creating a competitive advantage to certain alleles d. allowing two different species occupying the same niche to compete for resourcesarrow_forward2) The Hardy-Weinberg principle tells us what to expect when a sexually reproducing population is a.not evolving b.increasing in size c.changing in size d.evolving e.not evolving under natural selection specificallyarrow_forward
- Studies of opossums in Georgia have found that individuals from a population on an offshore island have longer lifespans in captivity than individuals from mainland populations. What is a reasonable explanation for this pattern? Group of answer choices a. the island opossums are vampires b. the opossums from the island have a history of being kept in captivity c. he opossums on the island have a lower metabolic rate d. there are fewer predators on the island compared to the mainlandarrow_forwardThe Grants have studied finches on the Galapagos Islabds for 40+ years. During times of drought there is less green/flowering vegetation available as a good source for the finches. This leaves only the hard seeds. The grants have found that during drought, finches with larger beaks survive at a higher rate because they can access food source. This would be an example of ____ A.Selective pressure B. good genes hypothesis C. handicap principle D. population variationarrow_forwardWhich of the following traits is more associated with an Opportunistic (Equilibrial) species? Which of the following traits is more associated with an Opportunistic (Equilibrial) species? A. Short maturation time B. Producing offspring at many different times over the course of life C. Producing a lot of eggs at one time D. High juvenile mortality E. High level of parental carearrow_forward
- A. Stabilizing Selection B. Disruptive Selection C. Directional Selection D. Normal Selection 26. A biologist studying wolves has collected data on the mass of meat caught per day from hunts by packs varying in size from 2 to 15 wolves. The data show that as pack size increases, the mass of meat available per pack member per day increases. Which additional study would provide evidence that pack hunting provides an advantage? A. Measure and compare the abili ty of wolves of varying ages to successfully engage in hunting. B. Observe whether an individual wolf hunts different types of prey than a pack of wolves hunts. C. Measure the ratio of male to female wolves engaging in hunting to see if it varies with pack size. D. Compare the average number of pups per litter that reach reproductive age for wolf packs of different sizes. luminate Education TM Inc.arrow_forwardWhen males and females of a population look or act differently, it is referred to as ________. a. sexual dimorphism b. sexual selection c. diversifying selection d. a clinearrow_forwardSexual selection occurs whena. one sex has a higher fitness than the otherb. a species exhibits sexual dimorphismc. there is a male dominance hierarchy and only the alpha male reproduces. d. There is monogamous mating.e. A trait is favored by one sex such that individuals of the opposite sex possessing that trait have an increased likelihood of reproducing.arrow_forward
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