Biology: Life on Earth
10th Edition
ISBN: 9780321729712
Author: Gerald Audesirk, Teresa Audesirk, Bruce E. Byers
Publisher: Benjamin Cummings
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Chapter 15, Problem 4FTB
A random form of evolution is called _________. This form of evolution occurs more rapidly and has a greater effect in populations that are ___________. Two important causes of this form of evolution are ________ and ___________. Which of these would apply to a population started by a breeding pair that was stranded on an island? ____________
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A random form of evolution is called_________ . This form of evolution ccurs more rapidly and has a greater effect in populations that are ___________ . Two important causes of this form of evolution are_______ and_________. Which of these would apply to a population started by a breeding pair that was stranded on an island?
A new phenotype arises due to a mistake that occurs during DNA replication in a germ line cell (which makes eggs/sperm) This violates the assumption of _______________because an evolutionary mechanism, ________________,is operating the population. (name the relevant Hardy-Weinberg assumptionand the evolutionary mechanism)
In a plant, the height of flower stalks is controlled by one gene. Flower stalks can be tall, medium, or short. Plants that produce tall flower stalks have the most offspring. This violates the assumption that _____________________ because an evolutionary mechanism , _____________________, is operating the population. ( name the relevant Hardy-Weinberg assumption and the evolutionary mechanism)
Chapter 15 Solutions
Biology: Life on Earth
Ch. 15 - The ________ provides a simple mathematical model...Ch. 15 - 2. Different versions of the same gene are called...Ch. 15 - An organism's ________ refers to the specific...Ch. 15 - 4. A random form of evolution is called _________....Ch. 15 - Competition is most intense between members of...Ch. 15 - 6. The evolutionary fitness of an organism is...Ch. 15 - 1. What is a gene pool? How would you determine...Ch. 15 - 2. Define equilibrium population. Outline the...Ch. 15 - How does population size affect the likelihood of...Ch. 15 - If you measured the allele frequencies of a gene...
Ch. 15 - 5. People like to say that “you can’t prove a...Ch. 15 - 6. Describe the three ways in which natural...Ch. 15 - What is sexual selection? How is sexual selection...Ch. 15 - In North America, the average height of adult...Ch. 15 - Malaria is rare in North America. In populations...Ch. 15 - By the 1940s, the whooping crane population had...Ch. 15 - Prob. 4ACCh. 15 - A preview question for Chapter 16: A species is...
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- Evolution is a process of___ in a population through___ variation over___ Evolution involves___ and___.arrow_forwardA change in structure, behavior, or physiology that enhances survival, and reproductive success in a particular environment is called _________. Genetic drift Mimcry Adaptation Gene flowarrow_forwardIn population genetics, evolution describes how _______ change from one generation to the next.arrow_forward
- What are the three conditions necessary for natural selection? (answer choices: differential reproductive success, adaptations, sexual dimorphism, heritability, homologies, variation) 1._____________ 2.____________ 3._____________arrow_forward_____________ is the evolutionary process by which populations evolve to become distinct species. Reproductive isolation, the end of ___________ between populations, is always part of the process by which sexually reproducing species achieve and maintain separate identities.arrow_forwardThe evolution of one species into two or more species as a result of different populations becoming reproductively isolated from each other is best termed as adaptive radiation. True or False.arrow_forward
- In a dichotomous classification system, __________. In a dichotomous classification system, __________. A population is repeatedly divided into four parts until a description identifies a single member. a population is repeatedly divided into two parts until a description identifies a single member A population first divided into two parts, then three parts, and then four parts, until a description identifies a single member. dichotomous keys are called natural keys A population is repeatedly divided into three parts until a description identifies a single member.arrow_forwardAn organism’s___________ refers to the specific alleles found within its chromosomes, while the traits that these alleles produce are called its_________ . Which of these does natural selection act on?__________arrow_forwardHenry 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_forward
- population of 600 scorpions was split into four populations when irrigation canals were built through their habitat. The four new populations were called the Northern, Southern, Eastern, and Western populations. Each new population consisted of about 150 individuals. The four populations continued to evolve, and no migration occurred among populations. One hundred generations later, each population still has about 150 individuals, and a biologist investigates them. Consider what a biologist expect to see in the four populations after 100 generations if the environment did not change for any of the populations. Would the biologist agree or disagree with the following statements? question 1 agree or disagree Differences among the four populations probably occurred when populations adapted to specific environments, because most evolution results in adaptation. question 2 agree or not Each population would probably have the same number of alleles—that is, versions of genes—than it…arrow_forwardDrag the labels from the left to their correct locations in the concept map on the right. evolution genetic variation Hardy-Weinberg equilibrium genetic drift adaptations sexual reproduction allele frequencies include individuals with differences due to sources are mutation Populations are units that undergo natural selection results in if change in may be in the if no change in can be altered by environment maintained only if gene flow Reset large population size, no. gene flow, no mutation, random mating, no natural selectionarrow_forwardThe Abert and the Kaibab species of squirrels live on opposite ends of the Grand Canyon. Physically they are very similar to each other, which leads scientist to think that when the Grand Canyon was shallower (millions of years ago) the populations use to have genetic contact (sexual reproduction). In present day, they are completely isolated from each other. When tested the Abert and Kaibab squirrels cannot produce a fertile offspring. This is an example of ___ speciation. [Fill in the blank]arrow_forward
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