Homework Answers
The fitness of a phenotype depend on frequency-dependent selection because frequency-dependent selection acts against extereme phenotypes.
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Why does the fitness of a phenotype depend on frequency-dependent selection? A. Because selection favors the...
In density independent populations, birth rate and death rate do not change with population density. In...
In density independent populations, birth rate and death rate do not change with population density. In contrast for density dependent populations: A Birth rates decrease and death rates decrease Birth rates increase and death rates increase C. Birth rates decrease and death rates increase Birth rates increase and death rates decrease QUESTION 8 Why does the fitness of a phenotype depend on frequency-dependent selection? Because selection favors the least common phenotype. Because the least number of alleles are at that...
Nitrogen fixation is a key component of biogeochemical cycling. It also represents an important inter-species interaction,...
Nitrogen fixation is a key component of biogeochemical cycling. It also represents an important inter-species interaction, which is: A. Commensalism between bacteria and animals B. Competition between plants and fungi C. Predation of bacteria by plants D. Mutualism between plant and bacteria In 1983, a population of dark-eyed junco birds became established on the campus of the University of California, San Diego (UCSD), which is located many miles from the junco's normal habitat in the mixed-coniferous temperate forests in the...
In cases of negative frequency-dependent selection, _______ phenotype typically has _______ fitness A the least common...
In cases of negative frequency-dependent selection, _______ phenotype typically has _______ fitness A the least common the lowest B the most common the highest C the least common the highest D the most common intermediate e intermediate the lowest
Exercise: Terms of Sexual Selection Instruction: Connect each term against its appropriate description through a line...
Exercise: Terms of Sexual Selection Instruction: Connect each term against its appropriate description through a line to match. Drag a line from each term on the left side to the corresponding description on the right side. Alternative mating strategies Selection that acts directly on a locus. Direct benefit A difference in the ability of an organism to perceive different stimuli (e.g., low vs high frequency sounds). Direct selection The gonads and closely associated structures that distinguish males and females. Fisher's...
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...
Find the calculations for the data of this population? a) Calculate the relative fitness for each...
Find the calculations for the data of this
population?
a) Calculate the relative fitness for each of the
three genotypes?
b) What is the mean fitness of this population, and
how do you expect it to change in response to selection?
c) Based on the calculations in a), calculate the
values of h and s. What type of selection has occured?
d) If the surviving individuals mate at random, what
will be the genotype frequencies in the next generation (...
QUESTION 18 Consider three cases of selection at a dialleic locus with alleles A1 and A2:...
QUESTION 18 Consider three cases of selection at a dialleic locus with alleles A1 and A2: Relative Fitnesses A2A2 A IAI A142 A2A2 - AIA A142 1242 AZAZ 1 0 .7 0.7 10.9 0.7 Initial Freq. of A1 -0.01; Generations - 500: Population size - Infinite. Al other conditions set to zero. Run the above model in the Alleel program Why does case 1 take so long to start to increase in frequency? Because natural selection can only act on...
Climate change is a threat to the existence of many species.
QUESTION 2 Climate change is a threat to the existence of many species. Which of the following limits to natural selection hinders the adaptation of species to the new climate conditions? The developmental plans of plants and animals are too complex. They cannot cope with the warmer temperatures. Mutations happen so frequently that beneficial alleles change before natural selection can substantially increase their frequency Many species not have gene variants in their gene pool that are beneficial in higher temperatures. Climate change happens so...
ON MULTIPLE CHOICE, CIRCLE LETTER OF ALL CORRECT ANSWERS!!! 31. (2 pts) True or False. Sexual...
ON MULTIPLE CHOICE, CIRCLE LETTER OF ALL CORRECT ANSWERS!!! 31. (2 pts) True or False. Sexual dimorphism is the phenomenon that caused biologists to focus on sexual selection. 32. ( pts) What is the most important basic underlying difference between the sexes that causes sexual selection to usually operate differently in males than in females? A. The cost of reproduction is usually higher in females. B. The cost of reproduction is usually higher in males. C. Males have only 1...
In the case of directional selection, if the advantageous allele (b) is recessive and a less...
In the case of directional selection, if the advantageous allele (b) is recessive and a less advantageous allele (B) is dominant: A. b will be lost in the population because the dominant allele will increase in frequency by natural selection B. b will increase in frequency at the same speed as if it was a dominant advantageous allele, because what matters is the coefficient of selection and not if the allele is dominant or recessive C. b will increase in...
In density independent populations, birth rate and death rate do not change with population density. In contrast for density dependent populations: A Birth rates decrease and death rates decrease Birth rates increase and death rates increase C. Birth rates decrease and death rates increase Birth rates increase and death rates decrease QUESTION 8 Why does the fitness of a phenotype depend on frequency-dependent selection? Because selection favors the least common phenotype. Because the least number of alleles are at that...
Exercise: Terms of Sexual Selection Instruction: Connect each term against its appropriate description through a line to match. Drag a line from each term on the left side to the corresponding description on the right side. Alternative mating strategies Selection that acts directly on a locus. Direct benefit A difference in the ability of an organism to perceive different stimuli (e.g., low vs high frequency sounds). Direct selection The gonads and closely associated structures that distinguish males and females. Fisher's...
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...
Find the calculations for the data of this
population?
a) Calculate the relative fitness for each of the
three genotypes?
b) What is the mean fitness of this population, and
how do you expect it to change in response to selection?
c) Based on the calculations in a), calculate the
values of h and s. What type of selection has occured?
d) If the surviving individuals mate at random, what
will be the genotype frequencies in the next generation (...
QUESTION 18 Consider three cases of selection at a dialleic locus with alleles A1 and A2: Relative Fitnesses A2A2 A IAI A142 A2A2 - AIA A142 1242 AZAZ 1 0 .7 0.7 10.9 0.7 Initial Freq. of A1 -0.01; Generations - 500: Population size - Infinite. Al other conditions set to zero. Run the above model in the Alleel program Why does case 1 take so long to start to increase in frequency? Because natural selection can only act on...
ON MULTIPLE CHOICE, CIRCLE LETTER OF ALL CORRECT ANSWERS!!! 31. (2 pts) True or False. Sexual dimorphism is the phenomenon that caused biologists to focus on sexual selection. 32. ( pts) What is the most important basic underlying difference between the sexes that causes sexual selection to usually operate differently in males than in females? A. The cost of reproduction is usually higher in females. B. The cost of reproduction is usually higher in males. C. Males have only 1...
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