Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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The Mexican spotted owl and the Northern spotted owl used to be the same species. They were separated by a river and adapted over time to best suit their different geographical locations with distinct climates and ecosystems. Over time, they differed so much from each other that they could not breed anymore and are considered two different species. What is this an example of?
Group of answer choices
Allopatric speciation
Stabilizing selection
Sympatric speciation
Bottleneck effect
Directional selection
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- In a population of birds, those with either very long or very short beaks are more successful at obtaining food resources than those with medium-sized beaks. Over time, the two extremes of beak size become more prevalent in the population. Which type of selection is occurring, and what might be the long-term consequence for this population? oooo Disruptive selection; speciation Directional selection; speciation Frequency-dependent selection; no change in the population Stabilizing selection; no change in the populationarrow_forwardThere are two major mechanisms that help populations evolve. The first is Natural Selection. The second is Prezygotic Isolation Genetic Drift Directional Selection Independent Assortmentarrow_forwardImagine there's a species of flower that blooms in early April. Some seeds are blown over a mountain and the offspring of those seeds start a new population on the other side. After several million years the mountain erodes and the two flower populations are reintroduced to each other. The population that lived on the far side of the mountain flowers in early May, while the other still flowers in early April. The two populations never hybridize, and become their own species. This is an example of: Gametic Barrier Temporal Isolation O Habitat Isolation O Behavioral Isolation 1.arrow_forward
- Which of the following evolutionary mechanisms can drive genetic divergence after the genetic isolation created by allopatry or sympatry? Select ALL that apply. 08 Natural selection Mutation Gene flow Genetic driftarrow_forwardA group of one species of bacteria are exposed to an antibiotic. The normal bacteria die but some are resistant to the antibiotic and start multiplying. The resistant bacteria flourish and now make up the majority of the population. This is an example of what? Speciation Reduction of Gene Flow Natural Selection Geographic Isolationarrow_forwardReproductive isolation leads to induced mutations emergence of separate species immunity to genetic drift high rates of gene flowarrow_forward
- Which part of these statements isn't right ? A species is a group of organisms that can potentially interbreed with one another to produce viable, fertile offspring. Speciation is when two new species form from one original one. Sympatric speciation occurs when there is a geographic separation of a population. Allopatric speciation occurs while the population remains in the same area. Adaptive radiation occurs when one species evolves into many to fill several different niches. Natural selection requires traits to be passed from parent to offspring, more offspring are produced than can survive creating competition, and inherited traits vary among offspring. Fossils, Anatomy and embryology, biogeography, and molecular biology all provide support for the theory of evolution. Evolution can be driven by many different things. Mutations are changes in DNA that create new alleles in a population. Gene flow is the flow of alleles in and out of a population resulting from the migration…arrow_forwardWhich type of selection best describes the shift in peppered moth from the light form to the dark form following the industrial revolution? Directional Stabilizing Disruptive 58arrow_forwardYou have sequenced the Rag1 gene in two populations of snails that vary in the amount of parasites. The Rag1 gene codes for proteins that affect the immune system. The results were analyzed looking for synonymous and nonsynonymous substitutions and are in the table below. Determine if the populations are under selection and comment on which population has the higher infection of parasites. Population 1 Population 2 Synonymous 5 6 Nonsynonymous 4 13arrow_forward
- Henry was studying two populations of the same species of lizards. One population lived on an island and the other lived on the mainland. Both populations were affected by a hurricane that hit the island and the mainland with equal force. A year later, Henry was testing the gene frequency and saw a decrease in genetic variation in the island species, but not in the mainland species. Which best describes a conclusion he might have reached? Gene flow greatly affects small populations, but large populations can recover. Genetic drift greatly affects small populations, but large populations can recover. Gene flow greatly affects large populations, but small populations can recover. Genetic drift greatly affects large populations, but small populations can recover.arrow_forwardLO Two species of fish, known as three-spined stickleback, live in a single lake in British Columbia. They are closely related but occupy different habitats within the lake. They exist nowhere else. These species most likely arose by sympatric speciation from a single species of three-spined stickleback. True Falsearrow_forward
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