When individuals enter or leave a population, the gene frequencies change.Migration interferes with nonrandom mating.Deer mice are usually found in the woods and are dark brown in color. The deermice that live in the Sand Hills of Nebraska, however, have evolved a lightercoloring, the result of a change in one gene. How does this information illustratend 2natural selection? *choolSpeciation occurs when groups are geographically isolated.The population evolved when the gene frequency remained the same.Individuals, not populations, evolve.A variation helped individuals to survive in their environment and to pass on theirgenes to the next generation.

Deer mice is a genus of rodents, Peromyscus. They have large eyes and two-tone colored fur. The dark…

Deer mice are usually found in the woods and are dark brown in color. The deer mice that live in the Sand Hills of Nebraska, however, have evolved a lighter coloring, the result of a change in one gene. How does this information illustrate natural selection? * O Speciation occurs when groups are geographically isolated. The population evolved when the gene frequency remained the same. Individuals, not populations, evolve. A variation helped individuals to survive in their environment and to pass on their genes to the next generation.

Deer mice are usually found in the woods and are dark brown in color. The deer mice that live in the Sand Hills of Nebraska, however, have evolved a lighter coloring, the result of a change in one gene. How does this information illustrate natural selection? * O Speciation occurs when groups are geographically isolated. The population evolved when the gene frequency remained the same. Individuals, not populations, evolve. A variation helped individuals to survive in their environment and to pass on their genes to the next generation.

Human Biology (MindTap Course List)

11th Edition

ISBN:9781305112100

Author:Cecie Starr, Beverly McMillan

Publisher:Cecie Starr, Beverly McMillan

Chapter23: Principles Of Evolution

Section: Chapter Questions

Problem 1CT

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Deer mice are usually found in the woods and are dark brown in color. The deer mice that live in the Sand Hills of Nebraska, however, have evolved a lighter coloring, the result of a change in one gene. How does this information illustrate natural selection?* O Speciation occurs when groups are geographically isolated. O The population evolved when the gene frequency remained the same. O Individuals, not populations, evolve. A variation helped individuals to survive in their environment and to pass on their genes to the next generation.
In a population of lizards, color is genetically determined. The current population has two two phenotypes: blue and yellow. Which of the following scenarios could result in evolution by migration? O A disease indiscriminately reduces the population by 90%. Birds are better able to see and therefor prey on blue lizards The population is joined by individuals from a nearby population that has an allele for a red phenotype. Females preferentially mate with individuals exhibiting the blue phenotype.
Which of the following examples does not match the given term? The Founder effect - two populations of birds from two different islands occasionally cross over on these islands to mate with each other. Gene flow - A group of fish is introduced to a neighbouring population and begin to reproduce with the resident fish Inbreeding- a mice with the genotype aa inherited both allele copies of a from the same grandparent. Population bottleneck - a populátion of frogs experiences a coldsnap which kills 75% of the population.
Lancaster County, Pennsylvania was first settled by a small number of Amish people in the early 1700's. The population has grown to over 85,000 individuals today, with most reproduction occurring within the group. Maple syrup urine disease affects only about 1 in 225,000 newborns in the U.S., but it affects 1 in 400 newborns in Lancaster. This high incidence of maple syrup urine disease in Lancaster probably reflects which phenomenon? O Assortative mating Natural selection Founder effect Mutation Gene flow
Natural selection acts on phenotypes within a population. As a result, over time, the phe- notypic frequencies in a population can change. The graph below shows how the pheno- type of a population changed after selection occurred. Number of Individuals B Value of Phenotype A graph that shows how phenotypic frequency changed before and after selection. с population after selection Which of the following scenarios would most likely result in the phenotypic change shown in the graph above? D original population A A population of rats live on the ground and in short trees. A tree-dwelling snake that preys on the rats is introduced into the area. Warming of the arctic tundra reduces the average snow cover that lighter-colored arctic foxes rely on for camouflage. Darker-colored arctic foxes are better suited to the ex- posed moss and grass habitat. Robins that lay smaller-than-average clutches of eggs produce fewer viable offspring, while larger-than-average clutches of eggs result in…
Gene flow often increases genetic diversity of populations that come together. Which of these is an example of when gene flow could reduce genetic diversity if two populations (Population A and Population B) come together? O The offspring with parents from population A and B have low survival because they are not adapted to the environment. O Individuals from population A have an allele that is not found in population B. O Individuals from population B have an allele that is not found in population B O Population A only has homozygous recessive alleles and population B only has homozygous dominant alleles.
Consider the first copy of an allele for insecticideresistance that arises by mutation in a populationof insects exposed to an insecticide. Is this mutation an adaptation? If, after some generations,we find that most of the population is resistant,is the resistance an adaptation? If we discovergenetic variation for insecticide resistance in apopulation that has had no experience of insecticides, is the variation an adaptation? If an insectpopulation is polymorphic for two alleles, eachof which confers resistance against one of twopesticides that are alternately applied, is thevariation an adaptation? Or is each of the tworesistance traits an adaptation?
A population of ducks had dull orange bills and an average size of 18 inches from bill to tail. Over time, some researches noticed that the average size of the ducks was still 18 inches, but that now many ducks were either much smaller or much larger and no ducks were actually 18 inches long. The researcher correctly identified that the ducks were undergoing ___A___ selection for size, The researcher also noticed that the bills were a much brighter orange in the ducks, and correctly identified ____B____ selection for bill colouration. A few years later, the researcher returned and noticed that only the male ducks now had bright orange bills and the females were less bright. The researcher hypothesized that ____C____ selection was occurring. Question 4 options: 123 Disruptive 123 Sexual 123 Directional 1. A 2. B 3. C
Sometimes gene flow between populations can have negative effects, with one population receiving genes of lower fitness from another population. Which of the following below is a good case example of this observation? O Tibetian highland people interbreeding with lowland people producing children of intermediate hemoglobin proteins OInterbreeding of Texas and Florida Panthers have greater survivorship than inbred Florida Panthers O Male Townshend Warblers out compete male Hermt Warblers and mate with female Hermit Warblers O Wild steelhead interbreeding with captive steelhead produced offspring with lower relative fitness
In the modern reckoning of evolution by natural selection, what is the most important feature that allows an allele to be more represented over time in a population? The allele makes the organisim stronger. The allele allows the organisim to produce more breeding offspring. The allele allows the organisim to eat more readily. The allele allows the organsims to escape predators readily.
Explain how these drawings illustrate an example of natural selection. Include the term "adaptive heritable trait" in your answer. A deer comes to eat. | A few weeks later the right-hand cactus has flowers. This figure shows the situation a few months later.
At the edge of the Arctic Circle, owls prey on field mice. Occasionally, in a litter of white field mice, a brown mouse appears. Because of greenhouse warming, the snow melts, changing the environment to shades of brown. Several white mice from the brown mice population are relocated to a region where it snows more often than their previous habitat. The population of white mice increase in this area where mice did not live before. What evolutionary concept is being illustrated? Genetic drift Bottleneck effect Natural selection Sympatric speciation