Which of the following is not true for a critically endangered species? Expression of deleterious alleles and increased homozygosity increases mortality of young, and inbreeding depression leads to reduced offspring fitness The individuals of the species which have declined to low numbers are still a genetically open system Loss of some allele from the species causing loss of genetic diversity with consequent inability to respond rapidly to selection Reduction of population breeding ability due to increased relatedness through the action of incompatibility mechanisms in plants or behavioural difficulties in animals

Which of the following is not true for a critically endangered species? Expression of deleterious alleles and increased homozygosity increases mortality of young, and inbreeding depression leads to reduced offspring fitness The individuals of the species which have declined to low numbers are still a genetically open system Loss of some allele from the species causing loss of genetic diversity with consequent inability to respond rapidly to selection Reduction of population breeding ability due to increased relatedness through the action of incompatibility mechanisms in plants or behavioural difficulties in animals

Biology Today and Tomorrow without Physiology (MindTap Course List)

5th Edition

ISBN:9781305117396

Author:Cecie Starr, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Christine Evers, Lisa Starr

Chapter12: Processes Of Evolution

Section: Chapter Questions

Problem 9SQ

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Imagine that you are a conservation biologist responsible for the well-being of a bufello herd consistingof 100 mature males and 100 mature females. In this herd, there is no appreciable mutation, there isno migration in or out, and there is no selection. At the Fuzzy gene locus, there are two alleles, G and E.Homozygous G individuals have fuzzy fur, homozygous E individuals have rough fur, and heterozygoteshave shaggy fur. Suppose you survey the herd and find that there are 44 fuzzy individuals, 72 shaggyindividuals, and 84 rough individuals.a)What is the size of the population?b)Do the alleles have a simple dominance relationship? Describe.c)What are the frequencies of the two alleles?d)Is the population in Hardy-Weinberg equilibrium?If not, how do you know, and what might be the cause?
The loss of genetic variability within populations is an important concern for conservation biologists when trying to conserve a species whose numbers have been greatly reduced due to loss of habitat. This is true for the example of the Bengal Tiger, Clemson’s mascot. This reduction of genetic variability in small populations affects their evolutionary potential. Which of the following are NOT potential consequences of the loss of genetic variability for tiger populations? A. Increased homozygosity can lead to the expression of deleterious recessive alleles B. Increases the ability of the population to adapt to changes in the environment C. Decreases the probability that the population can withstand a disease outbreak D. Increases the risk of extinction for the population
Natural selection tends to work toward genetic unity;the genotypes that are most fit produce the mostoffspring and increase the frequency of adaptive allelesin the population. Yet there remains a great deal ofvariability within the populations of species. Describethe factors that contribute to this genetic variability. Provide the link of references
One concept of conservation biology is known as minimum viablepopulation. Some species’ populations are so fragmented andsmall that they may have very little genetic variability left. Withminimal genetic variation in the population, there is little likelihoodthat a population can adapt to an environmental threat, such as anew disease. Florida panthers are at or below the minimum viablepopulation level (estimated population less than 80). 1)Do you think that it is practical to use limited resources toconserve a population like the Florida panther? 2)Why?
There are particular factors that cause the diversity in a gene pool to change. For each of the following statements, select the correct factor from the menu on the attached picture that is being described. The process by which organisms with certain heritable traits survive, passing on their traits to the next generation; determined by the environmental conditions of the time A change in allele frequencies caused by chance events in a small gene pool The movement of alleles into or out of a population by immigration or emigration The process of choosing mates based on the presence of certain traits or phenotypes and, thus, genotypes; traits are usually displayed in some form of courtship ritual A type of genetic drift that occurs when a natural disaster thins the population to a small group that happens to be unrepresentative of the original group; allele frequencies of the two groups will be dissimilar A type of genetic drift that occurs when a small population that is not…
What is a cline? A. Discrete changes in genetic or phenotypic characteristics of a population over geographic space. B. Similar genetic or phenotypic characteristics of a population within the same geographic space. C. A gradual change in genetic or phenotypic characteristics of a population over geographic space. D. A gradual change in genetic or phenotypic characteristics of a population within a set geographic space.
Which of these scenarios is an example of disruptive selection? Darker colored morphs in a butterfly population are more adaptive than lighter colored morphs, and lighter colored morphs are eliminated from the population. Intermediate gray morphs of a butterfly population are maintained, and the extreme dark and light color morphs have been eliminated. The dark and light color morphs of a butterfly population are maintained, and the intermediate gray morph has been eliminated from the population. A new, unique color form arises from a mutation in a population of butterflies.
The two populations are found in very similar environments (e.g., similar resources, same predators). The populations differ in population size as follows. Population 1 Population 2 Population size 600 420,000 Given this information, what is the likely cause of the differences in genetic variation among these populations? Population 1 Population 2 Heterozygosity No. of alleles Heterozygosity No. of alleles Gene 1 0.14 4 0.32 6 Gene 2 0.09 2 0.37 12 Gene 3 0.11 3 0.24 7 Gene 4 0.21 3 0.33 9 Gene 5 0.00 1 0.36 7 Gene 6 0.34 5 0.32 6 Gene 7 0.00 1 0.31 8 A.) natural selection is acting differently on these populations B.) mating is not random in population 1 C.) genetic drift in population1 has reduced genetic variation through increased fixation. D.) genetic drift in population2 has reduced genetic variation through increased fixation.
Pikas are small mammals that live at high elevations on the talus slopesof mountains. Most populations located on mountaintops in Coloradoand Montana in North America are isolated from one another: the pikasdon’t occupy the low-elevation habitats that separate the mountaintopsand don’t venture far from the talus slopes. Thus, there is little gene flowbetween populations. Furthermore, each population is small in size andwas founded by a small number of pikas.A group of population geneticists proposes to study the amount ofgenetic variation in a series of pika populations and to compare theallelic frequencies in different populations. On the basis of the biologyand distribution of pikas, predict what the population geneticists willfind concerning the within- and between-population genetic variation.
background: Lizards often have bright coloration and in some species there is variation in coloration within populations. For the sake of simplicity, let’s assume that color is genetically determined by a single gene with two alleles that interact in a codominant fashion: r+r+ = red, r+r- = yellow, r-r- = white. Imagine there is a large population of these lizards where 1 in 200 lizards have the white coloration, 30 are yellow and the rest are red. A tsunami sweeps through the population! Although no lizards died, 10 random lizards were swept to a nearby island. One of these individuals is white while the rest were yellow. Over time, these individuals remain stuck on the island and form a new population. Eventually, 80% of this population has the white coloration. Assume that color does not affect fitness in either population. question: At the time of the founding of the smaller population, (when 1/10 were white, the rest yellow), what was the chance of fixation of the r- allele via…
A meadow is home to a population of plants of a particular species. Among these individuals are 125 plants that have red flowers and 375 plants that have white flowers. The allele of the flower color gene that produces red flowers (R) is completely dominant over the white flower color allele (r). What is the frequency of the dominant R allele in this population? a- 0.75 b- 0.87 c- 0.13 d- 0.25
A species of fox may be brown (the dominant phenotype) or white (the recessive phenotype). Brown foxes have the genotype BB or Bb. White foxes have the genotype bb. The frequency in a population of foxes of the BB genotype is 0.27 B. Assuming that this population is operating under HWE, calculate the following: What is the frequency of the B allele in this population? What is the frequency of the b allele in this population? What is the frequency of heterozygous foxes in this population?