What process could explain a situation in which alleles that are favoured by natural selection (i.e....
What process could explain a situation in which alleles that are favoured by natural selection (i.e. those that confer high fitness) do not become fixed in a population?
Homework Answers
'The random fusion of gametes' is the process which leads to non fixation of favored allele in a population. Because the naturally selected individual has both advantageous and non advantageous allele. The individual produces gametes by the process of meiosis. These gametes have equal chances of random fusion with other gametes during fertilisation. That's why the unfavored allele persists in the population.
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What process could explain a situation in which alleles
that are favoured by natural selection (i.e....
heterozygote disadvantage Natural selection is the process by which organisms with the best adapted phenotype are...
heterozygote disadvantage Natural selection is the process by which organisms with the best adapted phenotype are selected for by environmental conditions. anthropogenic events such as the use of DDT heterozygote advantage Allelic frequencies can change due to selection or they may change due to genetic drift. environmental conditions The process of natural selection relies on the presence of of a gene within a population. genetic drift Deleterious alleles may persist in the population particularly if they confer a single allele...
Questino 7. How I genetic drift different from natural selection? A. Natural Selection occurs because some...
Questino 7. How I genetic drift different from natural selection? A. Natural Selection occurs because some alleles confer higher fitness, whereas genetic drift occurs because of sampling error. B. Natural selection has a stronger effect in large population, whereas genetic drift acts primarily in small populations. C. Natural selection is a mechanism of evoltion, whereas genetic drift is not a mechnaism but an outcome of evolution. D. Natrual selection tends to cause very rapid evolution whereas gentic drift tends to...
A study by Siepielski and Benkman demonstrated phenotypic selection on pinecones by granivorous (seed-‐eating) birds. Specifically,...
A study by Siepielski and Benkman demonstrated phenotypic selection on pinecones by granivorous (seed-‐eating) birds. Specifically, they found that interactions between the birds and pine trees span from antagonistic (birds are predators and confer a fitness disadvantage to the pines) to mutualistic (birds still eat seeds, but they cache what they cannot eat and confer a dispersal benefit to the pines) depending on the number of seeds produced in a population. Assume seed production is determined by two alleles that...
Select the statements that accurately describe the effect of natural selection on genetic equilibrium: a. It...
Select the statements that accurately describe the effect of natural selection on genetic equilibrium: a. It can cause allele frequencies in a population to be in genetic equilibrium. b. It can cause a dominant allele for a gene to become more abundant in a population. c. It can cause an allele to become more abundant in a population if it provides a fitness advantage over other alleles for that trait. d. It is an evolutionary force that prevents natural populations...
We expect natural selection and genetic drift to both result in the fixation of alleles, which...
We expect natural selection and genetic drift to both result in the fixation of alleles, which seems like it should reduce average heterozygocity in populations – there should be very little observed variation. However, we observe a tremendous amount of variation in populations. What can explain this observation?
1. Describe how the process of natural selection works, and how it results in adaptations (Darwin's...
1. Describe how the process of natural selection works, and how it results in adaptations (Darwin's Observations and Conclusions) • How does unequal reproductive success lead to natural selection? What are adaptations? Explain Darwin’s observations and conclusions. • Describe evolution by natural selection? What are some important points about evolution? 2. Describe examples of and evidence for evolution by natural selection that can be seen in your daily life. 3. Discuss the different kinds of evidence that support the theory...
Which of the following statements does not play a direct role in natural selection? Read all...
Which of the following statements does not play a direct role in natural selection? Read all choices before answering the question. a) Artificial selection. b) Individuals within the population, who have the greatest reproductive fitness, are those who produce the greatest number of offspring, who survive to reproduce the subsequent F2 ("grandkids") generation. c) A species will produce more offspring than environmental resources can support. Consequently, not all individuals survive and there is a competition for limited resources. d) Competition...
28.What is the definition of a gene pool? a. All alleles that exists in a population...
28.What is the definition of a gene pool? a. All alleles that exists in a population b. relative amount of each allele c. A few alleles that exists in a population d. Alternative versions of the same gene e. allele that is specific for a protein 29. Explain what is the Biological Species concept and its limitations. 30. T/F: An organism's fitness depends on their environment 31. Explain how the Sonoran Pocket Mice are a good example of Natural Selection....
BIOL 1020 Homework Evolution & Natural Selection 4 NATURAL SELECTION: 1. In your OWN words, explain...
BIOL 1020 Homework Evolution & Natural Selection 4 NATURAL SELECTION: 1. In your OWN words, explain what natural selection is. What is required? What is the result? 2. True or false? For natural selection to work, a population must have genetic variation. Explain your answer. 3. List three sources of genetic variation in a population. Identify which sources are most important for asexually reproducing organisms. Which method is most important for sexually reproducing organisms? 4. List three mechanisms which cause...
6. Which of these conditions will lead to evolution by natural selection? a. Heavy metal pollution...
6. Which of these conditions will lead to evolution by natural selection? a. Heavy metal pollution reduces reproductive success of all phenotypes of green algae in the pond. b. Variation among individuals is not genetic; instead it results from learned behavior or physiological environmental responses. c. Introduction of an exotic predator species results in one native prey phenotype evading predation while other phenotypes get eaten. d. Individuals of the population are clones (genetically identical). 7. Which one is used as...
heterozygote disadvantage Natural selection is the process by which organisms with the best adapted phenotype are selected for by environmental conditions. anthropogenic events such as the use of DDT heterozygote advantage Allelic frequencies can change due to selection or they may change due to genetic drift. environmental conditions The process of natural selection relies on the presence of of a gene within a population. genetic drift Deleterious alleles may persist in the population particularly if they confer a single allele...
Which of the following statements does not play a direct role in natural selection? Read all choices before answering the question. a) Artificial selection. b) Individuals within the population, who have the greatest reproductive fitness, are those who produce the greatest number of offspring, who survive to reproduce the subsequent F2 ("grandkids") generation. c) A species will produce more offspring than environmental resources can support. Consequently, not all individuals survive and there is a competition for limited resources. d) Competition...
28.What is the definition of a gene pool? a. All alleles that exists in a population b. relative amount of each allele c. A few alleles that exists in a population d. Alternative versions of the same gene e. allele that is specific for a protein 29. Explain what is the Biological Species concept and its limitations. 30. T/F: An organism's fitness depends on their environment 31. Explain how the Sonoran Pocket Mice are a good example of Natural Selection....
BIOL 1020 Homework Evolution & Natural Selection 4 NATURAL SELECTION: 1. In your OWN words, explain what natural selection is. What is required? What is the result? 2. True or false? For natural selection to work, a population must have genetic variation. Explain your answer. 3. List three sources of genetic variation in a population. Identify which sources are most important for asexually reproducing organisms. Which method is most important for sexually reproducing organisms? 4. List three mechanisms which cause...
6. Which of these conditions will lead to evolution by natural selection? a. Heavy metal pollution reduces reproductive success of all phenotypes of green algae in the pond. b. Variation among individuals is not genetic; instead it results from learned behavior or physiological environmental responses. c. Introduction of an exotic predator species results in one native prey phenotype evading predation while other phenotypes get eaten. d. Individuals of the population are clones (genetically identical). 7. Which one is used as...
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