Study Guide for Campbell Biology
11th Edition
ISBN: 9780134443775
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece, Martha R. Taylor, Michael A. Pollock
Publisher: PEARSON
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Chapter 23, Problem 20TYK
Summary Introduction
Introduction: The field of biology that deals with the study of the composition of genetic material within a population is called population genetics. Certain factors that lead to the process of evolution are natural selection, genetic drift, mutation, and migration; all these lead to changes in the genetic composition. Other selection processes that are involved in adaptive evolution involves the selection of a particular trait that gives rise to adaption according to the environment.
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Which of the following statements does not support the conclusion that giraffes are k-selected species? a. Giraffes are approximately 6’ tall and weigh 150 lbs at birth. b. Wild giraffes begin mating at 6-7 years of age. c. Newborn giraffes are capable of coordinated walking within an hour of birth, and running within 24 hours of birth. d. Giraffes rarely give birth to twins.
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Which of the following is an example of a question about mechanism (not function)?
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Chapter 23 Solutions
Study Guide for Campbell Biology
Ch. 23 - a. What is a major source of genetic variation for...Ch. 23 - In a population of 200 mice, 98 are homozygous...Ch. 23 - Use the allele frequencies you determined in...Ch. 23 - Practice using the Hardy-Weinberg equation so that...Ch. 23 - Prob. 5IQCh. 23 - Why hasnt the highly deleterious sickle-cell...Ch. 23 - a. What is Hardy-Weinberg equilibrium? b. Define...Ch. 23 - Prob. 2SYKCh. 23 - Prob. 1TYKCh. 23 - Prob. 2TYK
Ch. 23 - Prob. 3TYKCh. 23 - Prob. 4TYKCh. 23 - Mice have an estimated 1,000 olfactory receptor...Ch. 23 - Prob. 6TYKCh. 23 - If a population has the following genotype...Ch. 23 - In a population with two alleles, B and b, the...Ch. 23 - Prob. 9TYKCh. 23 - Prob. 10TYKCh. 23 - In a random sample of a population of shorthorn...Ch. 23 - Genetic drift is likely to be seen in a population...Ch. 23 - Porphyria variegata is a genetic disease...Ch. 23 - Cystic fibrosis is a very serious genetic disorder...Ch. 23 - Prob. 15TYKCh. 23 - Prob. 16TYKCh. 23 - Prob. 17TYKCh. 23 - Prob. 18TYKCh. 23 - Prob. 19TYKCh. 23 - Prob. 20TYKCh. 23 - Prob. 21TYK
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- In some cases, males or females do care for young of their own species that are not their own, as when certain male fish take over and protect egg masses being brooded by other males or when female ducks acquire ducklings that have just left someone else’s nest. Propose alternative hypotheses to explain this phenomenon. Under what circumstances might adoptions actually raise the caregiver’s reproductive success? Under what other circumstances might adopters help nongenetic offspring as a cost of achieving some other goal? Don't write from any online source..arrow_forwardSome females seem to prefer the green colouration and some females seem to prefer the blue colouration. What type of selection is this an example of? a. stabilizing b. balancing c. directional d. diversifyingarrow_forwardWhat does positive assortive mating mean? a. Individuals that are different for a certain trait are more likely to mate b. Individuals that are alike for a certain trait are less likely to mate c. Individuals that are alike for a certain trait are more likely to mate d. Any individuals may mate randomly Give typing answer with explanation and conclusionarrow_forward
- Fireflies use light signals to locate mates. Individuals with smaller, and thus less visible, lightorgans are less successful at mating. In January of 1985, a highway with bright streetlightswas constructed through a prairie where a firefly population lives. This created a selectionpressure for brighter (larger) light organs in the population. The light organ was, on average,4 mm long in the population prior to the construction of the highway. In 2005, the averagelight organ size in this population (before mating) was 6 mm. This firefly species has1 generation per year, and the narrow sense heritability ( h^2) of the light organ is 0.1.a) What is the strength of selection (S) for the larger light organ.b) What was the mean light organ length of successfully reproducing individuals in 1985(the first year of selection)?arrow_forwardA. In terms of the barriers in place that keep species separate, explain whether song recognition is a prezygotic barrier or a post-zygotic barrier. B. Explain which type of isolating mechanism this wouldbe once you determine the barrier type. C. Discuss why song would be a barrier to mating with another species and having the incorrect song might change your fitness potential.arrow_forwardBirds are more likely to form pair-bonds than mammals because … Group of answer choices: A. Bird reproductive physiology makes it easier to judge paternity certainty B. Flight makes it easier to find mates C. Bird species are unable to defend critical resources the way mammals can D. Male mammals have higher levels of testosterone making them more likely to fight E. Either bird parent can sit on the nest or feed chicks while the chicks are too young to flyarrow_forward
- Identify whether each of the following scenarios is most likely to result in stabilizing, disruptive, or directional selection a) Beetles that emerge from hibernation too early are more likely to killed by frost, those that emerge too late will miss the chance to mate [Select ] b) Frogs with mating calls that are between 400 and 600 chirps per minute attract more mates than frogs with calls that are lower than 400 chirps per minute or greater than 600 chirps per minute [ Select ] c) Plants with the largest leaves are better able to gather sunlight in the rainforest [ Select ] d) Giraffes with longer necks can reach more leaves, but they have a harder time pumping blood from their heart up to their brain [Select] e) Mice with the lighter fur are better camouflaged from predators than mice with darker fur V [ Select ] stabilizing selection disruptive selection directional selectionarrow_forwardIn Biology of Beauty, Cowley found that contemporaryfemales are attracted to males with broad foreheads and strong chins, and that this effect persisted across different cultures. How did Cowley explain this result? A. This is a trick question- this attraction is culturally relative B. Males compete for access to females by developing these features as a form of male-male competition C. There is no evidence that females really are differentially attracted to males with these features D. Attraction to males with these features is adaptive for females because males with these traits are usually sexually mature and have healthy immune systems E. Only some human cultures value these traits as attractive.arrow_forwardWhy are polyandrous mating systems more rare than polygynous matings? a. Only males are capable of multiple rounds of reproduction within a single breeding season. b. Only females care for the young. c. Females usually experience more intrasexual selection pressure than males. d. Females usually devote more energy to offspring production and development.arrow_forward
- In the digger bee, some males engage in female defense polygyny, whereas other smaller males exhibit scramble competition polygyny. Describe these two mating systems and explain how they are maintained in male digger bee population.arrow_forwardWhich of the following changes would cause directional selection? a A habitat made of trees with light-colored bark and newly soot-covered bark results in moths that are either white or black. b An increase in intermediate-colored rocks leads to the decrease in light-colored mice and dark-colored mice. c A shortage of water leads to the death of many aquatic plants. d There is an abundance of large seeds available, leading to an increase in the beak size of birds.arrow_forwardAnswer part A using the given dataarrow_forward
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