Biology (MindTap Course List)
11th Edition
ISBN: 9781337392938
Author: Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Publisher: Cengage Learning
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Chapter 20, Problem 2TYU
The reproductive isolating mechanism in which two closely related species live in the same geographic area but reproduce at different times is (a) temporal isolation (b) behavioral isolation (c) mechanical isolation (d) gametic isolation (e) hybrid inviability
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Decide whether each of the following scenarios would lead to prezygotic or postzygotic reproductive
isolation:
a) Dragonflies from two different populations have genitals that do not match, so they can't mate
successfully [Select ]
b) Two different species of fish have very different courtship displays, but they can mate and produce a
non-fertile offspring [Select]
c) One species of plant flowers in the winter, while another flowers in early spring
[ Select ]
d) The gametes of two tree species can fuse, but a zygote does not form
[ Select ]
e) A mountain range separates two populations of snakes
I Select]
Which of the following reproductive isolating mechanisms prevents mating because the two species are physically unable to mate? (a) ecological isolation (b) behavioral isolation (c) mechanical isolation (d) gametic isolation (e) all of the above
ADJUST
Negative assortative mating means that organisms choose mates that are different
from themselves. If negative assortive mating occurs in a population, what would
expect to happen to genotype frequency over generations?
O a) Frequency of the heterozygous genotype will increase.
b) Frequency of the homozygous genotypes will decrease.
O c) Frequency of the homozygous genotypes will increase.
O d) Both A and B
AUTO
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Chapter 20 Solutions
Biology (MindTap Course List)
Ch. 20.1 - Describe the biological species concept and list...Ch. 20.1 - Prob. 1CCh. 20.1 - Prob. 2CCh. 20.1 - Prob. 3CCh. 20.2 - Explain the significance of reproductive isolating...Ch. 20.2 - What barriers prevent wood frogs and leopard frogs...Ch. 20.2 - How is temporal isolation different from...Ch. 20.2 - Prob. 3CCh. 20.2 - Of which postzygotic barrier is the mule an...Ch. 20.3 - Prob. 3LO
Ch. 20.3 - Explain the mechanisms of sympatric speciation and...Ch. 20.3 - What are five geographic barriers that might lead...Ch. 20.3 - Prob. 2CCh. 20.3 - Prob. 3CCh. 20.4 - Prob. 5LOCh. 20.4 - Prob. 1CCh. 20.5 - Define macroevolution.Ch. 20.5 - Discuss macroevolution in the context of novel...Ch. 20.5 - Prob. 8LOCh. 20.5 - Why are evolutionary novelties important to...Ch. 20.5 - Prob. 2CCh. 20.5 - Prob. 3CCh. 20.5 - What is the relationship between mass extinction...Ch. 20 - A prezygotic barrier prevents (a) the union of egg...Ch. 20 - The reproductive isolating mechanism in which two...Ch. 20 - Interspecific hybrids, if they survive, are (a)...Ch. 20 - The first step leading to allopatric speciation is...Ch. 20 - The pupfishes in the Death Valley region are an...Ch. 20 - Which of the following evolutionary processes is...Ch. 20 - According to the punctuated equilibrium model, (a)...Ch. 20 - The evolutionary conversion of reptilian scales...Ch. 20 - Adaptive radiation is common following a period of...Ch. 20 - The Hawaiian silverswords are an excellent example...Ch. 20 - VISUALIZE Use two different colors to depict the...Ch. 20 - Prob. 12TYUCh. 20 - EVOLUTION LINK Could hawthorn and apple maggot...Ch. 20 - Prob. 14TYUCh. 20 - EVOLUTION LINK Examine Figure 20-2c and predict...
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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
- 27) In the fruit fly speciation experiment, individuals from separate populations that were raised using the same food source were more likely to attempt mating with each other than individuals raised on different food sources. Why? A) Because they had adapted to their environment in the same way B) Because this is an example of allopatric speciation C) Because the separate populations were able to carry out some gene flow D)Because the jars were accidently placed next to each other so the males and females were able to recognize each 28) What is needed for natural selection to occur? A) Variation sexual reproduction, competition B) Variation, heritability competition C)Variation, competition, time D) Heritability, competition, sexual reproductionarrow_forwardBased on the biological species concept, which of the following would lead biologists to conclude that different populations of lizards were actually a single species rather than two different species? A.) lizards from the two different populations mate rarely, and produce hyrbid offspring that are sterile B.) Lizards from the two differnt populations mate during different seasons C.) Lizards from the two different populations mate regularly and produce sterile offspring D.) Lizards from the two different populations matre regularly and produce viable offspring capable of reprodarrow_forwardWhat is the ecological definition of a species? A) A group of individuals that can breed and produce viable offspring B) A group of interbreeding individuals that share the same environment C) A group of individuals that share a common ancestorarrow_forward
- 1) Many organisms have the ability to reproduce asexually as well as perform sexual reproduction. A Scientist, John Smith, was conducting research on aphids that can undergo both methods of reproduction. He determined the males in his population had fertilization rate of 1.8 and a relative fitness of outcrossed offspring was 1.1. a) What is the equilibrium frequency of males in this population? b) Is this population stable equilibrium and why?arrow_forwardNegative assortative mating means that organisms choose mates that are different from themselves. If negative assortive mating occurs in a population, what would expect to happen to genotype frequency over generations? a) Frequency of the heterozygous genotype will increase. b) Frequency of the homozygous genotypes will decrease. c) Frequency of the homozygous genotypes will increase. O d) Both A and Barrow_forwardSometimes physical elements can prevent several of the individual composing an original population from mating with each other on a regular basis, eventually engendering different species. This process is called: Question 5 options: A) Gene flow. B) Genetic Drift. C) Speciation. D) Allopatric Speciation. E) Sympathetic speciation.arrow_forward
- based on the image attached a) Explain how genetic drift caused egg hatching to decrease in the late 1980s and 1990. b) Why did hatching improve following translocations? c) What are the general effects of gene flow between populationsarrow_forwardIf (positive) assortative mating increases in a population, what would expect to happen to genotype frequency over generations? O a) Frequency of the heterozygous genotype will increase. b) Frequency of the homozygous genotypes will decrease. O c) Frequency of the homozygous genotypes will increase. O d) There will be no change in genotype frequency.arrow_forwardWhat is Allopatric speciation? A) When a population is separated from the main group by a barrier and becomes a new species B) When a population mutates into a new species C) When a population develops into a new species without any physical barriers to isolate themarrow_forward
- 13) Lake Malawi in Africa is home to about 200 species of allopatrically speciated cichlid fish. However, recent development around the lake is reducing the visabiliy in the lake, and as a result recently diverged species are merging back together. Why? A) Because the geneflow between species has been reduced due to the reduction in visability B) Because those species have not evolved a second reproductive isolation mechanism in addition to sexual selection C) Because the open water habitat is no longer as habitable, so the open water species are now using the bottom habitat D) Because the bottom habitat is no longer habitable, so the bottom habitat species are not using the open water habitat, leading to more hybridizationarrow_forwardIn which situation will populations experience gene flow? A)hybridization between two populations of ground beetles B)natural-selection pressures between two populations of dragonflies C)mate competition between two populations of red-legged grasshoppers D)intersecting migration routes between two populations of monarch butterfliesarrow_forwardAccording to the punctuated equilibria model,(A) given enough time, most existing species will branchgradually into new species.(B) most new species accumulate their unique features relatively rapidly as they come into existence, then changelittle for the rest of their duration as a species.(C) most evolution occurs in sympatric populations.(D) speciation is usually due to a single mutation.arrow_forward
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