Natural selection occurs 1. when a new genetic variation occurs that allows individuals to have a reproductive and survival advantage 2. when a factor in the environment alters the genetic information in DNA of all members of a species 3. when a small number of individuals of a population break away and form a new population

Natural selection occurs 1. when a new genetic variation occurs that allows individuals to have a reproductive and survival advantage 2. when a factor in the environment alters the genetic information in DNA of all members of a species 3. when a small number of individuals of a population break away and form a new population

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter11: Meiosis And Sexual Reproduction

Section: Chapter Questions

Problem 17RQ: Hydras and jellyfish both live in a freshwater lake that is slowly being acidified by the runoff...

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QUESTION 26 When thinking about changes in allele frequencies over time, why do you care more about the effective population size rather than the census (total number of individuals) population size?
QUESTION 8 Morphological differences are abundant among many species. We make assumptions about why adaptations exist, but to understand whether a specific trait is a adaptive and why, researchers must create experiments that have all the following, EXCEPT: a. replication of each treatment to ensure reliability of results. b. hypotheses that are testable and falsifiable. c. include control groups. d. exceedingly small sample sizes in each treatment group. e. experimental design that enables all full interpretation of differences.
QUESTION 16 You are examining a beloved population of trillium in the backyard of your childhood home. You recall as a child that flowers were bright white. As you return to the population you note that many (but not all) of the flowers have a faint purple vertical stripe in the middle of each petal. List each of Darwin’s postulates and what must be true about your population if it has undergone evolution by natural selection for petal color.
QUESTION 18 Describe: Population aging and increased longevity are creating more multi- and intergenerational families in the U.S. Give two examples of ways in which family structure and family roles are changing because of these changes.
QUESTION 9 Recent genetic research indicates that ____ or more individuals are needed for an endangered species to maintain its capacity for biological evolution. a. 100 b. 1,000 c. 10 d. 100,000 e. 10,000
QUESTION 23 Allele frequencies for eye color in a population of hippogriffs is p=0.73. How many individuals would you expect to be heterozygous in a population 150? (Assume HWE)
QUESTION 13 Feather color in a certain species of bird is controlled by a pair of alleles that exhibit incomplete dominance. If birds that are homozygous for one allele are black and birds that are homozygous for the other allele are white, then heterozygous birds would be a. gray. b. white. c. black. QUESTION 20 Which of the following might explain how two separate genes control a single trait? a. One gene function better at higher temperatures. b. Both genes have the same alleles. c. There are two genes to control two separate steps in a pathway. d. Two genes cannot control a single trait.
QUESTION 14 Darwin’s finches on the Galapagos Islands are a group of species of finches. One of the major features noted is the variation in beak depth. We spent some time talking about the variation in the ground finch population and how that changed overtime and how that change corresponded to changes in environmental conditions, which affected food item characteristics and abundance. The changes in beak depth over time is a result of… a. natural selection b. gene flow c. sexual selection d. artificial selection
QUESTION 31 You are examining a population that has recently been subject to artificial selection for larger filet size (body size) through selective breeding in a commercial fishery. The artificial selection took quite a few generations, but the researchers were eventually successful. Which of the following statements is most likely true? a. There is likely no correlation between parent and offspring filet size (body size). b. The population experiencing artificial selection always has higher fitness than wild populations. c. The offspring of the selected population will, on average, be larger than the wild populations. d. The filet size (body size) of the fish is most likely controlled by a single gene.
QUESTION 22 Tiktaalik and Archaeopteryx are very important transitional forms. They provide evidence for evolution through examples of: a. microevolution b. macroevolution c. migration d. speciation
QUESTION 8 In a certain population of rabbits, 25 new rabbits are born and five move into the population from surrounding areas during a single year. However, 10 rabbits die, and five leave the population during the same time frame. What is the population change for that year? a. 30 b. No change c. 15 d. 25 e. 10
QUESTION 42 Two different populations that have a high degree of gene flow are expected to… a. have similar levels of heterozygosity. b. have an FST close to 1. c. be completely isolated from each other. d. vary in allele frequency from one another.