BIOLOGY -TEXT
14th Edition
ISBN: 9781260710878
Author: Mader
Publisher: RENT MCG
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Chapter 16, Problem 2TC
You are observing a grouse population in which two feathers
Matings with dark-feathered males: 13 Matings with bright-feathered males: 32 Propose a hypothesis to explain why females apparently prefer bright-feathered males. What selective advantage might there be in choosing a male with alleles that make it more susceptible to predation? What data would help test your hypothesis?
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You are observing a grouse population in which two feather phenotypes are present in males. One is relatively dark and blends into the shadows well, and the other is relatively bright and more obvious to predators. The females are uniform dark feathered. Observing the frequency of mating between females and the two types of males, you have recorded the following:
Mating’s with dark feathered males: 13
mating’s with a bright feathers male: 32
Propose a hypothesis to explain why females apparently prefer bright feathered males. What selective advantage might there be in choosing a male with alleles that make it more susceptible to predation? What data would help test this hypothesis?
A population is solely comprised of 152 A2A2 individuals. 7 A1A1 individuals migrate in and contribute to the mating pool. What is the frequency of A1A2 individuals in the offspring?
Populations that are in Hardy-Weinberg equilibrium will display random mating and will be relatively large in size.
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Chapter 16 Solutions
BIOLOGY -TEXT
Ch. 16.1 - 1. List the five conditions necessary for...Ch. 16.1 - Prob. 2CYPCh. 16.2 - Prob. 1CYPCh. 16.2 - Prob. 2CYPCh. 16.2 - Prob. 3CYPCh. 16.3 - Prob. 1CYPCh. 16.3 - 2. Demonstrate how sickle-cell disease is an...Ch. 16 - Prob. 1TCCh. 16 - You are observing a grouse population in which two...Ch. 16 - Prob. 3TC
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- Name some traits for which you think humans exhibit nonrandom mating. Is mating for these traits likely to be positive or negative assortative mating? Name some traits for which you think people mate randomly. How could you test whether mating for these traits is random?arrow_forwardA population of mealworm beetles (Tenebrio molitor) called the founder generation-consisting of 150 Black (MM) individuals, 100 Brown (Mm) individuals and 250 Orange (mm) individuals-is established on a remote region of Puerto Rico. Mating within this population occurs at random, the three genotypes are selectively neutral and mutations occur at a negligible rate. (a) What are the frequencies of alleles M and m in the founder generation? Frequency of allele M= Frequency of allele m= (b) Calculate p2, 2pq, q2 and the expected number of MM individuals, Mm individuals, and mm individuals in the population, assuming that the population is in Hardy-Weinberg equilibriumarrow_forwardA population of horses in the magic land is having a problem. Individuals are not mating randomly and they are only mating with those that have the same flying speed as their own: Fast (FF), Medium speed (FS), or Slow (SS). You arrive to this magical land and count the following horses of each flying velocity: Fast = 71 Medium speed = 90 Slow = 31 If we consider these results Generation 1, what are the expected number of Medium speed individuals for each genotype in Generation 3 if we have only inbreeding, that is, FF only reproduces with FF; FS only reproduces with FS; and SS only reproduces with SS?arrow_forward
- Intrasexual selection involves competition among one sex (typically males) for mating access to the other sex. Intersexual selection involves mate choice in which individuals from one sex (typically females) choose their mates from among individuals of the other sex. Imagine a group of males that is engaged in agonistic behavior, from which Male A emerges triumphant. Now imagine a female that is assessing all of the males that were involved in the fights, and chooses Male A. Explain why this situation shows how intrasexual and intersexual selection pressures are likely both at play in the trait selection.arrow_forwardDiscuss examples of positive and negative assortative mating in natural populations, human populations, and agriculturally important species.arrow_forwardIn a population of snails, two alleles, T and t, affect the thickness of the shell, and the degree to which the snails are protected from predation. TT individuals have thick shells, which repel predators, and survive best. Tt individuals have medium shell thickness and survive 88% as well as do TT individuals. tt individuals have thin shells and are easy for predators to eat; they survive only 14% as well as do TT individuals. In a population of gametes at the start of a generation, the frequency of the t allele is 0.23. What is the frequency of the t allele in the gametes that will produce the next generation? 91% 77% 23% 18% cannot calculate with the information given 34%arrow_forward
- within a randomly mating population of beagles, the homozygous presence of the recessive allele 'm' causes lemon color pattern, while the presence of dominant allele M produce a tri-color pattern. A survey was made in a town and of the 167 tagged, 83 has lemon color. Question: Determine the frequency of the dominant allele; number of animals have the dominant allele; number of animals that are heterozygous; number of animals that have homozygous recessive gene.arrow_forwardIn a population of 500 individuals in Near East, the frequencies of the dominant and recessive alleles for autosomal recessive genetic disease PKU are 0,89 and 0,11 respectively. A is used to indicate the dominant allele, a is used to indicate the recessive allele. Assuming random mating, what are the expected genotype frequencies?arrow_forwardA population is solely comprised of 56 A2A2 individuals. 9 A1A1 individuals migrate in and contribute to the mating pool. What is the frequency of A1A2 individuals in the offspring? Answer to 2 decimal places.arrow_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_forwardA population is solely comprised of 120 A2A2 individuals. 18 A1A1 individuals migrate in and contribute to the mating pool. What is the frequency of A1A2 individuals in the offspring? Answer to 2 decimal places. Hint: Use the Gene Flow table!arrow_forwardThere is a species of fish in which homozygous recessive (rr) individuals are Yellow and homozygous dominant (RR) individuals are Red. Color in this species of fish exhibits incomplete dominance. If we mate a homozygous dominant individual with a heterozygous individual, what is the phenotypic ratio of the offspring? Group of answer choices 2 Red : 2 Orange. 4 Red. 3 Red : 1 Yellow. 1 Red : 2 Orange : 1 Yellow.arrow_forward
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