The average length of rabbit ears decreases gradually with increasing latitude. This is an example of which of the following? Group of answer choices a. genetic drift b. directional selection c. disruptive selection d. stabilizing selection
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- Assuming that this population is randomly mating, the following relative fitnesses represent what kind of selection? p = f[A], q = f[a] Genotype Relative Fitness AA p2 Aa 0.5 aa q2 Select one: O a. Overdominant b. Underdominant O c. Positive Frequency Dependent O d. Negative Frequency Dependent O e. Balancing Of. Directional g. Two of the above. Based on the Evolutionary Pathways in Nature reading by John Avise, how many of the following statements are true? -Red pandas and giant pandas are not each other's closest relatives. - Both red pandas and giant pandas are ursids. - Eggs are unique to birds. - HIV-1 in humans is more closely related to SIV from chimpanzees than it is to HIV-2 in humans. Select one: O a. None of these statements are correct. O b. One statement is correct. Two statements are correct. O d. Three statements are correct. O e. All four statements are correct.Which of the following is NOT true of stabilising selection a. it occurs when inidivuals with extreme trait values have lower fitness than those with intermediate trait values. b. it keeps the mean close (or moves it closer) to the optimum value c. it can result from opposing directional selection, such as when early flowering makes flowers susceptible to herbivores, but late flowering reduces the availability of pollinators. d. it does not improve the fitness of the population to the environment. e. it decreases the range of variation in the populationSelection that causes one extreme phenotype to be more frequent in a population is an example ofa. disruptive selection.b. stabilizing selection.c. directional selection.d. equivalent selection.
- A gene exists in two alleles, and the heterozygote has the highest fitness. This situation is likely to result in a. directional selection. c. disruptive selection. b. stabilizing selection. d. balancing selection.The continued presence of the allele that causes sickle cell anemia in areas where falciparum malaria is prevalent demonstrates which of the following phenomena? (a) inbreeding depression (b) frequency-dependent selection (c) heterozygote advantage (d) genetic drift (e) a genetic bottleneckThe MN blood group is of interest to population geneticists because (a) people with genotype MN cannot receive blood transfusions from either MM or NN people (b) the MM, MN, and NN genotype frequencies can be observed directly and compared with calculated expected frequencies (c) the M allele is dominant to the N allele (d) people with the MN genotype exhibit frequency-dependent selection (e) people with the MN genotype exhibit heterozygote advantage
- Match the modes of natural selection with their best description. ____ stabilizing a. eliminates extreme forms of a trait ____ directional b. eliminates midrange forms of a trait ____ disruptive c. shifts phenotypes in one directionWhich of the following situations will lead to natural selection? a. The seeds of two plants land near each other and one grows larger than the other. b. Two types of fish eat the same kind of food, and one is better able to gather food than the other. c. Male lions compete for the right to mate with females, with only one possible winner. d. all of the aboveIn many cases, one type of organism puts selection on another, so they evolve together. For example, flowers and the pollinators. This is called artificial selection Above statement True or False? give explanation
- A local pond is a favorite habitat for Canadian geese. Coyotes prey on geese and typically hunt either old or fat geese. After several years, the average of age and weight of the geese have reduced. These changes are due to: O A Stabilizing selection O B Negative frequency dependent selection C Directional selection D Disruptive selection O E Heterozygote advantagePeople with two copies of the sickle cell gene are often quite ill with sickle cell anemia, while those with two copies of normal hemoglobin are likely to become quite ill with malaria where it occurs. Heterozygotes suffer few effects of sickle cell anemia, and are considerably resistant to malaria. In areas where malaria occurs, it exerts on the human population. O A. Directional selection O B. Disruptive selection O C. Bimodal selection O D.Stabilizing selection O E. None of the above «< Question 20 of 120 A Moving to another question will save this response. 12:01 12/16/2 6. PgUp PgDn F12 PrtScn F8 Home F9 End F10 F11 DII F5 F7 F6 F4 F3 & #3 7 8. 9. 3 Y U R 近Match the following statements with the appropriate term The terms are: a.Genetic polymorphism b. Stabilizing selection c. Directional selection d.gene flow e. Vestigial f.heterochrony g. Cline i. Polyploidy j. genetic drift L. Natural selection m. Sexual dimorphism n. Adaptation o. Homology p. Convergence q. Disruptive selection Match the following statements with the appropriate term random fluctuation in gene pool (e.g., bottleneck & founder effect) Answer 1 mutational change that results in individuals with more than two sets of chromosomes, sometimes leading to a distinct species Answer 2 when adult males and adult females of the same species differ in their physical appearance Answer 3 similar adaptations resulting from a common ancestor (for example, all canines have long snouts because their common ancestor did, too). Answer 4 genetic input from other populations Answer 5 favours intermediate variants by acting against both extremes Answer 6 accumulation of…