Q: Describe the effects of the disappearance of beaver from an ecosystem on the wolf population
A: Introduction An ecosystem is a functional and structural unit of ecology in which living species…
Q: Organisms such as ferns that may occur randomly on a forest floor, do not display competition.…
A: The answer of this question is False. Because the ferns found on the forest floor do show…
Q: All members of a cohort are the same_____ . a. sex b. size c. age d. weight
A: Introduction An ecosystem deals with both biotic and abiotic factors and their interaction with…
Q: A population of 1,492 finches is introduced to a rainforest. Over the next year, the finches show a…
A:
Q: Mark Recapture can be written as M N = R Define each term. Use this equation to answer the following…
A: Introduction A population is the total number of people who live in the same area. The population…
Q: Which statement about environmental stochasticity is true? O A. Environmental stochasticity places…
A: When the parameters that decide human fates and population growth change from year to year, this is…
Q: Now suppose that the researchers repeat their chocolate study, this time using new individuals for…
A: Blood pressure is defined as the pressure with which blood flows through our circulatory system.
Q: B) Migration is a one-way movement. C) Because their offspring return to the ocean, the entire…
A: Salmon are considered “anadromous” which means they live in both fresh and salt water. These are…
Q: Ifthe age distribution diagram is bottom heavy or pyramidal in shape, thisindicates that the…
A: Population refers to all the organisms of the same group or species that live in a particular area…
Q: When r is a positive number, the population size is (a) stable (b) increasing (c) decreasing (d)…
A: The population size in an ecosystem is affected by four important factors: immigration, immigration,…
Q: A group of acarologists recorded 6,723 black-legged ticks (Ixodes scapularis) per acre in one patch…
A: Ecology is the study of of the interaction between biotic and abiotic components of the environment.
Q: In a type I survivorship curve, mortalitya. rises steeply later in life.b. is the same at any age.c.…
A: There are two main components of nature- organisms and the environment. The branch of biology that…
Q: om a population perspective under a constant reproductive rate of 1- fspring per female per…
A: Growth rates refer to the percentage change of a specific variable within a specific time period.
Q: Carrying capacity is and is represented by the letter on the graph. O he maximum number of…
A: Population size The population size of an ecosystem depends upon food, shelter, area, etc.
Q: Women, white in USA, 1939-1941 B Women in India 1921-1930 Theore tical population with haif-life of…
A: A survivorship curve measures the proportion of individual in a particular species that can survive…
Q: Contrast the selective pressures operating in high-density populations (those near the carrying…
A: Selection pressures are external agents that can change or affects the organism’s ability to survive…
Q: If N<k, the value of r is negative and the population declines. Natural populations may grow at…
A: The equation for logistic growth is: dN/dt = rN (K-N)/K When N<<<<K Which means…
Q: The observation that members of a population are uniformlydistributed suggests that(A) resources are…
A: Population is the term given to the group of organisms occupying a particular area. Uniform…
Q: 3. Calculate the approximate doubling time for a population growing at 7.0% per year. A. about 1…
A: The population growth occurs by cell division process. By this process from one individual two…
Q: An example of a limiting factor would be the amount of food available in a population. True False
A: Introduction :- A limiting factor is something that restricts the size of a population and slows or…
Q: The“mean generation time” of a population equals:a.(x lxmx)/R0.b.nx.c.lx mx.d.x lx mx.e.none of the…
A: The mean generation time can be defined as the average length of time taken by the individual of a…
Q: As population and affluence increase so does the environmental impact. However, technology can…
A: As population and affluence increase, the environmental impact may or may not increase. Technology…
Q: Species with limited resources usually exhibit a(n)________ growth curve.a. logisticb. logicalc.…
A: THE NUMBER OF INDIVIDUAL OF A PARTICULAR SPECIES THAT A PARTICULAR ENVIRONMENT CAN SUPPORT IS CALLED…
Q: (A) G= N K – N) K (C) (B) (х-аxis) Question: What does the dotted line represent? O a. carrying…
A: The nature of increasement of individuals in a population is known as growth form. Characteristic…
Q: Habitats with moderate levels of disturbance have higher species diversity. A) True B) False
A: Habitats with moderate level of disturbance have higher species diversity is false because at…
Q: Population AA Aa aa 0.41 0.09 0.50 Given this distribution, what is the frequency of aa in the next…
A: In a population there are individuals with homozygous dominant ,heterozygous dominant and homozygous…
Q: Competition can lower the K for both species that are involved in the interaction. True False
A: Introduction: Competition between two species come into play when the resources utilized by both the…
Q: Infinite resources are often a source of conflict and competition. a)True B)False
A: Ans TRUE.
Q: EVOLUTION CONNECTION Contrast the selective pressuresoperating in high-density populations (those…
A: Population density is the term given to the number of organisms inhabiting a particular area of…
Q: Calcuate the lx(Survivorship which is equal to proportion of population surviving from birth) and…
A: Introduction :- Life table tells us about all the details of an population in an given interval of…
Q: A population will most likely deplete the resources of its environment if the population
A: Answer: Environment = The area surrounds us and the atmosphere surrounds us including, plants,…
Q: True False If N<K, the value of r is negative and the population declines Organisms that produce…
A: Reproduction is the act in which the offsprings are produced and multiplied at an regular rate. The…
Q: community that has low % overlap most likely has a ___species turnover. a. low b. high c. no
A: species turnover is the number of species eliminated and replaced per unit time.
Q: A late frost killed many of the tomato plants in neighbourhood gardens, greatly decreasing the…
A: Limiting factors are the factors which bring down the extension and magnitude of a population . It…
Q: The changes in the leading determinants of mortality between the time periods reflected by Figure 2A…
A: Disease is any disorder that affects the body's normal physiology and metabolic activity Example of…
Q: All species have a tolerance limit before they are no longer well suited to live in their…
A: Every organism has a set limit of parameters (e.g. temperature, pressure, pH etc) , outside which…
Q: If the animal population increased, the amount of atmospheric carbon would: A. increase B.decrease…
A: If the animal population increased, the amount of atmospheric carbon would: B. DECREASE
Q: One argument for hunting and fishing is to limit wildlife populations to near 1/2 K. WHY is this…
A: Hunting can be isolated into three general classes: "resource hunting" (nourishment for own…
Q: The allee effect is the population growth principle th
A: Answer: The Allee effect is a phenomenon in biology characterized by a correlation between…
Q: A community is Group of answer choices a. Factors that affect population size and how and why it…
A: The studies of organisms and their interactions with their surroundings are known as Ecology. An…
Q: The purpose of the experiment is to study how_______(IV) affects the ______(DV). Explain the…
A: The carrying capacity for a population is the maximum population of a particular species that a…
Q: What impact did commercial whaling have on blue whale populations? A It slightly decreased the…
A: The blue whale is an underwater animal so it requires a high and continuous supply of oxygen…
Q: Vhich of the following can limit where a population is located? roturo
A: The word "population biology" has a variety of connotations. In 1971, Edward O. Wilson et al. coined…
Q: Explain why you agree or disagree with the followingpropositions:a. Stabilizing population is not…
A: Introduction A population is the smallest unit of any ecosystem which collectively includes the…
Q: A sudden natural catastrophe resulting in massive die-offs would be categorized as a…
A: Many species are absent from the area which is a suitable habitat because of several factors:- 1)…
Q: A reef that receives most of its fish recruits from other reefs and supplies few larvae to other…
A: * coral reef coral reef is in water can form of colonies of coral polyps of calcium carbonate.C *…
Q: The population described in this table is: O A) growing O B) declining O C) stable
A: The population growth here is
Answer part B using the given table
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- Color blindness in humans is caused by an X-linked recessive allele. Ten percent of the males of a large andrandomly mating population are color-blind. A representative group of 1000 people from this population migrates to a South Pacific island, where there are already1000 inhabitants and where 30 percent of the males arecolor-blind. Assuming that Hardy–Weinberg equilibrium applies throughout (in the two original populationsbefore the migration and in the mixed population immediately after the migration), what fraction of malesand females can be expected to be color-blind in the generation immediately after the arrival of the migrants?Sympatric speciation by allotetraploidy has been proposed as acommon mechanism for speciation. Let’s suppose you were interestedin the origin of certain grass species in southern California.Experimentally, how would you go about determining if some ofthe grass species are the result of allotetraploidy?Tiny foxes live on the Channel Islands off the coastof Southern California; the adults weigh less than3 lbs. These so-called island foxes (Urocyon littoralis) derived from the mainland gray fox (Urocyoncinereoargenteus). Analysis of genome sequencesrevealed that unlike the mainland foxes, the foxeson a single island have shockingly little geneticdiversity.a. The genome of only one fox from each island wassequenced. How would the lack of genetic diversitybe evident in a single genome sequence?b. The populations of the foxes on each island aresmall. How might the low diversity have occurred?c. Why is low genetic diversity thought to lead tospecies extinction?d. Hypothesize as to why the Channel Island foxesare thriving without human assistance despite theirlack of genome sequence diversity
- n the savannahs of the Amazon different species of the genus Ipomoea are pollinated by either bumblebees or hummingbirds; lavender flowered I. marabaensis and red flowered I. cavalcantei. Which of the follwing data would support the suggestion of natural interspecific hybridization with weak postzygotic isolation? A. magenta flowered hybrids found in the wild were infertile and bidirectionally crossing with parental species B. magenta flowered hybrids found in the wild were preferentially pollinated by introduced honeybees rather than parental pollinators C. In the laboratory, offspring resulting from crosses between I. cavalcantei, I. marabaensis showed a mixture of parental floral characteristics D. In the laboratory, offspring resulting from crosses between I. cavalcantei, I. marabaensis and magenta flowered hybrid plants were autotropic and showed hybrid viabilityThe original source of new alleles, upon which selection operates,is mutation, a random event that occurs without regard to selectionalvalue in the organism. Although many model organismshave been used to study mutational events in populations, someinvestigators have developed abiotic molecular models. Soll et al.(2006. Genetics 175:267–275) examined one such model to studythe relationship between both deleterious and advantageousmutations and population size in a ligase molecule composed ofRNA (a ribozyme). Soll found that the smaller the population ofmolecules, the more likely it was that not only deleterious mutationsbut also advantageous mutations would disappear. Whywould population size influence the survival of both types ofmutations (deleterious and advantageous) in populations?In the western United States, populations of an annual plant can be found almost continuously from San Diego to Seattle. Even though individuals from the San Diego and Seattle populations never come into contact, they can still be considered part of the same species under the ________ species concept because they can potentially interbreed. A.biologicalB.morphologicalC.lineageD.habitat
- Human geneticists have found the Finnish populationto be very useful for studies of a variety of conditions.The population is small; Finns have extensive churchrecords documenting lineages; and few people havemigrated into Finland. The frequency of some recessive disorders is higher in the Finnish population thanelsewhere in the world, and diseases such as PKU andcystic fibrosis that are common elsewhere do not occur in the Finnish population.a. How would a population geneticist explain thesevariations in disease occurrence?b. The Finnish population is also a source ofinformation for the study of quantitative traits. Thegenetic basis of schizophrenia is one question that canbe explored in this population. What advantage(s) anddisadvantage(s) can you imagine for studying complex traits based on the Finnish population structure?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.Different species of crickets have distinct songs, andthey use these songs for mate recognition. Researcherscrossed two species of Hawaiian crickets (Laupala paranigra and L. kohalensis) whose songs are distinguishedby pulse rate (the number of pulses per second; Shaw etal., Molecular Ecology 16, 2007, 2879–2892.) Then, theymapped QTL in the F2 population derived from thiscross. Six autosomal QTL were detected. The mean traitvalues (pulses per second) at the three genotypic classesin the F2 for each QTL are shown in the table below,where P indicates the L. paranigra allele and K indicatesthe L. kohalensis allele.a. Calculate the additive (A) and dominance (D) effectsand the D/A ratio for each of the six QTL.b. Which of these QTL shows the greatest amount ofdominance?c. Which of these has the largest additive effect?d. The mean pulse rate for L. kohalensis is 3.72, and it is0.71 for L. paranigra. Do all six QTL act in the expecteddirection with the L. kohalensis allele conferring a…
- In March 2013, the American Journal of HumanGenetics published a report that an AfricanAmerican man who submitted his genome forcommercial genealogical analysis had a Y chromosome whose sequence was very different from thatof other Y chromosomes that had been characterized previously. The investigators then found thatcertain males among the Mbo (an ethnic group inCameroon) shared many of the polymorphisms firstfound in this African-American man. How do youthink these findings would have altered estimates ofwhen a man carrying the MRCA for the human Ychromosome would have lived on the earth?Assuming that the mutation rate is µ/gamete/generation andthe population size is N diploid individuals, what is the numberof new mutations introduced into the population each generation?A botanist studying water lilies in an isolated pond observedthree leaf shapes in the population: round, arrowhead, and scalloped.Marker analysis of DNA from 125 individuals showed theround-leaf plants to be homozygous for allele r1, while the plantswith arrowhead leaves were homozygous for a different allele atthe same locus, r2. Plants with scalloped leaves showed DNA profileswith both the r1 and r2 alleles. Frequency of the r1 allele wasestimated at 0.81. If the botanist counted 20 plants with scallopedleaves in the pond, what is the inbreeding coefficient F forthis population?