Class Notes (808,554)
Canada (493,288)
Biology (2,220)
BIO120H1 (1,171)

BIO A01 Lecture 26 Questions.docx

11 Pages
Unlock Document

University of Toronto St. George

BIO A01 : Lecture 26- Practice Questions 1.) Determine whether the following statement is true or false. Genetic variation can only be assessed qualitatively. a.) True b) False 2.) Snapdragons are ideal species for the use of hardy-weinberg principles because: a.) They exhibit complete dominance for flower pigment b.) They exhibit incomplete dominance for flower pigment c.) They exhibit co-dominance for flower pigment d.) They are nicely coloured Considering the Following Chart To Answer Questions 3-5. Flower Colour (Phenotype) Genotype Number of Individuals Red C CR 350 Pink C CW 400 W W White C C 250 3.) Calculate the Genotype frequency for each flower phenotype. a.) Red: 0.1725 ; White: 0.125; Pink: 0. 2 ; b.) Red: 0.2; White: 0.125; Pink: 0.1725; b.) Red: 0.350; White:0.250; Pink: 0.400; c.) Red: 0.200; White:0.400; Pink: 0.250; 3.) Calculate the total number of C and C alleles: 4.) What is the allele frequency of the C allele? a.) 0.45 b) 0.55 c) 0.35 d)0.65 5.) Which of the following is true about a population at Hardy-Weinberg Equilibrium. a.) The frequencies of alleles in a population can change as long as genotype frequencies remain constant b.) The frequencies of alleles and genotypes will remain constant c.) Neither frequencies of alleles or genotypes need to remain constant. All that matters is constant phenotypes. 6.) Which of the following are not true of a population at Hardy-Weinberg equilibrium? a.) Only Mendelian segregation and recombination can be at work b.) There are no mutations occurring c.) The population cannot be subject to immigration or emigration. d.) The population size is at stable carrying capacity. e.) Individuals mate randomly Consider the Following for questions 8-10. The coat colours of an animal are black, white and gray, and are governed by incomplete dominance. Assume that the frequency of a black animals in a population is 0.6, and that the population meets all the expectations of the Hardy-Weinberg equilibrium theory. 7.) Calculate the genotype frequency expected for the black coat colour locus. 8.) Calculate the genotype frequency for the white coat colour locus. 9.) Calculate the genotype frequency for the gray coat colour locus. 10.) In the hardy-weinberg equilibrium equation, which of the following denotes the heterozygous genotype? a.)P^2 b.) Q^2 c.) +2pq d) -2pq 11.)Which of the following is not an agent of microevolution? a.) Mutation b.) Gene Flow c.) Genetic Drift d.) Random Mating e.) Natural Selection 12.)Which of the following is not true about mutation: a.) It is significant over shorter time scales b.) Deleterious mutations are harmful to organisms c.) Deleterious mutations are also predominantly known to cause death d.) Mutation is a spontaneous, heritable variation in DNA 13.)Evolutionarily speaking, which of the following mutations would be favoured in an organism? a.) Deleterious Mutation b.) Lethal Mutation c.) Neutral Mutation d.) Beneficial Mutation e.) None of the Above 14.)Which of the following statements are not true about gene flow? a.) Gene flow refers to the movement of alleles across different populations b.) Gene flow can occur only through the movement of individuals from one population to another c.) Life history, and behavior can modify the occurrence of gene flow d.) Dispersal agents can increase the occurrence of gene flow 15.)Which of the following statements is not true regarding genetic drift? a.) Genetic drift refers to a nonrandom change in allele frequency b.) Genetic drift is more important to smaller populations c.) Genetic drift reduces genetic variability d.) Population bottleneck and founder effect are two ways in which genetic drift can occur 16.)Population bottleneck: a.) Can lead to a random fluctuation of alleles that persists over time. b.) Is often caused by catastrophic events. c.) Leads to minute changes in population size d.) Has the potential to increase genetic variation. 17.)Which of the following is not a type of natural selection? a.) Directional Selection b) Destabilizing selection c) Disruptive Selection 18.) In the image below, indicate the specific type of selection depicted from left to right. a.) Destabilizing, Disruptive, Directional b.) Disruptive, destabilizing, Directional c.) Stabilizing, Disruptive, Directional d.) Disruptive, Stabilizing, Directional 19.) Problem: Consider the coat colour locus for mice (black, white & gray). Imagine you are taking a sample of 100 mice: 60 are black mice, 10 are gray mice and 30 are white mice. Calculate the allele and genotype frequencies in this sample. Lecture 27 Practice Problems 1. When the population deviates from the null model of the Heidy-Weinburg Principle this indicates: a) The population is in equilibrium b.) The population is not in equilibrium c.) The population is evolving d.) All of the above e.) 2 of the above 2. There is a population of beavers in Ontario with varying teeth length. The teeth never stop growing and larger teeth are hardest on the front and have softer inner sides. This keeps the teeth sharp to gnaw at trunks and branches. Due to foresting, trees in the area have a selection toward thicker bark. What type of selection will be favored for the beavers? a) Directional Selection toward short, hard teeth b) Stabilizing selection toward intermediate teeth length c) Directional selection toward longer, hard teeth d) Disruptive selection toward large or small teeth e) Two of the above 3. Opposing forces lead to _________. a) Directional selection b) Stabilizing selection c) Disruptive selection d) Natural selection e) Sexual Selection 4. When bird species like peacocks have females choosing males with brightly colored feathers. This is an example of: a) Directional selection b) Stabilizing selection c) Disruptive selection d) Natural selection e) Sexual Selection 5. Which is not a reason why variation still exists when selection is strong? a) Not all females have strong preferences b) Females cannot always mate with the ‘best’ male c) Trait that is being selective for has relatively high fitness but is not absolute d) Trait that is being selected against will have no reproductive success e) None of the above 6. Which is not one of the 4 agents of evolution a) Genetic Drift b) Gene flow c) Natural selection d) Sexual selection e) Mutation 7. A couple living in Kenya have 5 children. One was diagnosed with sickle cell anemia and year later malaria takes the life of 1 other child. Why didn’t the rest of the family catch malaria? a) The couple must have vaccinated every child b) Natural selection favored for the Heterozygote HbS carriers to survive c) The child who died of malaria did not had no HbS allele and was susceptible to the pathogen. d) All of the above e) Two of the above 8. Which of the following is not a mechanism of balancing selection? a) Heterozygote advantage b) Positive frequency-dependent selection c) Negative frequency- dependent selection d) Fitness varies in time and space e) None of the above 9. Negative frequency dependent selection if when fitness of a genotype______ as its frequency _________. a) Decreases, increases b) Remains the same, increases c) Increases, decreases d) Increase, remains the same e) Decrease, remains the same 10. Male common side-blotched lizards have three behavioral morphs: defend large territories and maintain large harems of females, defend smaller territories and keep one female, or mimic females in order to sneak mating from the other two morphs. The morph of defending large territories is the most common and mimicry the least common. Yet the mimicry strategy is still maintained within the species. How is this possible? a) Heterozygote advantage b) Positive frequency-dependent selection c) Negative frequency- dependent selection d) Sexual selection e) Two of the above 11. Natural selection leads to: a) Adaptation b) Acclimatization c) Absolute optimum of a trait d) Competitive optimum of a trait e) Random variants 12. Why can’t natural selection form perfect organisms? a) Evolution is limited by historical constraints b) Selection can only act on existing variants c) Adaptations are compromises d) Chance, natural selection and environment have interactions e) All of the above 13. Which is not an example of adaptive evolution? a) Fish populations had to adjust to subzero temperatures in the Gulf of Mexico for the summer of 2011 b) Giraffes a 100 years ago had on average shorter necks by 2.5 centimeters c) Monkey flowers only live in arid, dry landscapes d) Males with bigger manes were more successful in passing their genes to the next generation e) None of the above 14. What is a constraint of adaptive evolution? a) Environments are constantly changing overtime b) Each generation is adapted to the environment the parents were c) Most environments have competing selective pressure d) All the above Answers: 1e, 2c, 3b, 4e
More Less

Related notes for BIO120H1

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.