Campbell Biology 11th Edition - Valuepack
11th Edition
ISBN: 9780134833545
Author: Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece Neil A. Campbell Lisa A. Urry
Publisher: PEARSON
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Textbook Question
Chapter 24, Problem 24.3CR
What factors can support the long-term stability of a hybrid zone if the parent species live in different environments?
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What specific reproductive isolation mechanism is being described by each following statements
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How many of the gene trees do you expect to look like the species tree?
b)
You observe three gene trees in which species X and Z are the closest relatives and seven gene trees where X and Y are the closest relatives. What can you conclude from these data?
Group of answer choices
Historical hybridization between species W and X
Historical hybridization between species X and Y
Historical hybridization between species X and Z
Historical hybridization between species Y and Z
Prezygotic isolating mechanisms prevent hybrid offspring from occurring between species because (a) the resulting offspring are not fertile and cannot reproduce. (b) the egg and sperm fuse and form a zygote, but it does not survive. (c) the egg and sperm do not ever meet or, if they do, cannot fuse to form a zygote. (d) all of the above
Chapter 24 Solutions
Campbell Biology 11th Edition - Valuepack
Ch. 24.1 - Prob. 1CCCh. 24.1 - WHAT IF? Suppose two bird species live in a...Ch. 24.2 - Summarize key differences between allopatric and...Ch. 24.2 - Prob. 2CCCh. 24.2 - WHAT IF? Is allopatric speciation more likely to...Ch. 24.2 - MAKE CONNECTIONS Review the process of meiosis in...Ch. 24.3 - 1. What are hybrid zones, and why can they be...Ch. 24.3 - WHAT IF? Consider two species that diverged while...Ch. 24.4 - Speciation can occur rapidly between diverging...Ch. 24.4 - Prob. 2CC
Ch. 24.4 - MAKE CONNECTIONS Compare Figure 13.12 with Figure...Ch. 24 - Explain the role of gene flow in the biological...Ch. 24 - Can factors that cause sympatric speciation also...Ch. 24 - What factors can support the long-term stability...Ch. 24 - Is speciation something that happened only in the...Ch. 24 - The largest unit within which gene flow can...Ch. 24 - Prob. 2TYUCh. 24 - Prob. 3TYUCh. 24 - Prob. 4TYUCh. 24 - Which of the following factors would not...Ch. 24 - Plant species A has a diploid chromosome number of...Ch. 24 - Prob. 7TYUCh. 24 - SCIENTIFIC INQUIRY DRAW IT In this chapter, you...Ch. 24 - WRITE ABOUT A THEME: INFORMATION In sexually...Ch. 24 - Prob. 10TYU
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- Why might captive-breeding programs that reintroduce species into natural environments fail?arrow_forwardHeterosis is a) the appearance of spontaneous mutations. b) a method of artificial breeding that reduces heterozygosity. c) caused by inbreeding. d) when offspring have a phenotypic improvement over their parents.arrow_forward5a) It is generally considered that blue or purplish colored flowers attract bees as pollinators. Red flowers often attract birds such as hummingbirds as pollinators. Is this an example of prezygotic or postzygotic isolating mechanisms? Why? 5b) The graphs in your textbook show that the parental species are partially isolated by living at somewhat different altitudes in the mountains. In nature, the two parental species are also strongly (but not completely) isolated by using different pollinators (bees vs. hummingbirds). Is the presence of altitudinal separation combined with different pollinators likely to give more reproductive isolation in nature compared to each isolating mechanism alone? Why? 5c) Do the figures showing the F2 generation of the flowers suggest that these traits of flower shape and flower color are polygenic or due to single gene loci? Give a reason for your answer. 5d) Looking at the other graphs for this example that are shown in your textbook, is there any…arrow_forward
- 18) The common edible frog of Europe is a hybrid between two species, Rana lessonae and Rana ridibunda. The hybrids were first described in 1758 and have a wide distribution, from France across central Europe to Russia. Both male and female hybrids exist, but when the hybrids mate with other hybrids or with adults of either species, they are rarely successful in producing offspring. What can you infer from this information? A) Postzygotic isolation exists between the two frog species. B) Prezygotic isolation exists between the two frog species. C) These two species are likely in the process of fusing back into one species. D) The hybrids form a separate species under the biological species concept. 19) There is an island in the middle of a large river that houses a large population of ants. Damming of the river causes the island to flood and only the highest points of the island are now above water. The ants cannot swim, so are now in multiple isolated populations. Which of the…arrow_forwardWhat factors causes two hybrid populations to Separate What factors causes two hybrid populations to Come back together What factors causes two hybrid populations to Not to change. A) Reinforcement B) Fusion C)Stabilityarrow_forwardWhy is variation beneficial to the species but not necessary for the individual?arrow_forward
- Anisogamy is the term for sexual dimorphism in gamete size. a) Discuss the evolution of anisogamy from an ancestor in which gametes had equal size. What factors would lead to a divergence in gamete size among members of a population? b) Sexual selection can be strong in some species, and weaker in others. What determines the strength of sexual selection for a certain species? Discuss the differences in sex roles and Bateman’s Principle in your answer.arrow_forwardA vestigial trait in species A is a trait that is functional in a closely related species B, but non-functional in species A. a)True b)Falsearrow_forwardA conservation biologist studied four generations of a population of rare Ethiopian jackals. When the study began, there were 47 jackals in the population, and microsatellite analysis showed a heterozygosity of 0.55. In the second generation, an outbreak of distemper occurred in the population, and only 17 animals survived to adulthood. These jackals produced 20 surviving offspring, which in turn gave rise to 35 progeny in the fourth generation. a) What was the effective population size for the four generations of this study? b) Based on its effective population size (use the rounded off value you obtained in a), what is the heterozygosity of the jackal population in generation 4 (t=4)? c) What is the inbreeding coefficient in generation 4, assuming an inbreeding coefficient of F = O at the beginning of the study (t=1), no change in microsatellite allele frequencies in the gene pool, and random mating in all generations?arrow_forward
- a.) In either a secondary or a primary hybrid zone, what do the graphs above indicate about the relative fitness of the hybrid toads away from the 0-kilometer site on the cline? Why? b.) One explanation for the “stepped cline” in both gene frequencies and morphology is that B. bombina and B. variegata first diverged in allopatry and are now forming a secondary hybrid zone. Is the spatial pattern of genetic and morphological variation consistent with this explanation? Why or why not? c.) What would have to be true for the ecological niches of these two-color forms of toad for disruptive selection to be acting on so many loci in parapatry?arrow_forwardIs it possible for individuals within the same species to naturally have no variations between them? If such individuals exist, what term is used to describe them?arrow_forwardThere are four sterility alleles (S1, S2, S3, S4) in a population of pear trees (2N). How many different stigma genotypes are the pollen grains from a S2/S2 tree compatible with? A) 0 B) 1 C) 4 D) 6 E) 10arrow_forward
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