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 19TYK
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There is a population of cats and 16% of the cats this population show a recessive trait.
a. What is the frequency of the recessive allele?
b. What is the frequency of the dominant genotype?
c. What is the frequency of cats with the heterozygous genotype?
A population of birds may have red feathers or orange feathers. Red feathered birds have the genotype RR or Rr. Orange feathered birds have the genotype rr. The frequency of the RR genotype is .46 a. What is the frequency of heterozygous birds? B. What is the frequency of the R allele ? C. What is the frequency of r allele?
A population of birds may have red feathers Show work here: (the dominant phenotype) or orange feathers (the recessive phenotype). Red feathered birds have the genotype RR or Rr. Orange feathered birds have the genotype r. The fequency of the RR genotype is 46.
a. What is the frequency of heterozygous birds?
b. What is the frequency of the R allele?
c. What is the frequency of the r allele?
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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- 1)A population of 500 individuals has 231 homozygous dominant individuals, 218 heterozygotes, and 51 homozygous recessive individuals. Determine the frequency of the recessive genotype and frequency of the recessive allele, respectively. a. Frequency of Recessive Genotype Frequency of Recessive Alleles 0.32 0.10 b. Frequency of Recessive Genotype Frequency of Recessive Alleles 0.10 0.32 c. Frequency of Recessive Genotype Frequency of Recessive Alleles 0.90 0.10 d. Frequency of Recessive Genotype Frequency of Recessive Alleles 0.68 0.32 2)A rabbit warren has 300 individuals. The coat colour of rabbits is expressed through incomplete dominance. The coat colour can be dark brown, light brown, or white.There are 81 dark brown rabbits, 150 light brown rabbits, and 69 white rabbits. Assume that all of the conditions are met for a population in Hardy–Weinberg equilibrium.What is the light brown genotype frequency,…arrow_forwardAssuming a population is in Hardy-Weinberg equilibrium, an increase in the frequency of the p(A) allele from 0.6 to 0.9 would result in which of the following outcomes? a. A decrease in the number of homozygous dominant individuals within the population b. A decrease in the number of homozygous recessive individuals within the population c. An increase in the number of homozygous recessive individuals within the population d. An increase in the number of heterozygotes within the population e. No change in genotypic frequency within the populationarrow_forwardIn achondroplastic dwarfism, an autosomal dominant disease, the gene is lethal in homozygotes. If the frequency of the normal allele is 0.99, what is the heterozygote frequency? a. 0.01 b. 0.02 c. 0.98 d. 0.99 An autosomal recessive gene is lethal in homozygotes. In a population at Hardy- Weinberg equilibrium, how many generations will it take to eliminate the gene from the population a.100 b.It will not be eliminated from the population. c.1 d.25arrow_forward
- In a Hardy-Weinberg population with two alleles, G and g, that are in equilibrium, 40% of the alleles are recessive. What percentage of the population is homozygous for the dominant allele? a. 9% b. 36% c. 70% d. 60% e. 30%arrow_forwardIn a population 25 individuals that recently emigrated from a mainland population to form a new population on an unpopulated island the frequency of the dominant allele is 0.64. What is the probability of fixation in the next generation? a. 100% b. 36% c. 64% d. 75%arrow_forwardAnswer the following questions: a. A gene has 2 alleles, R and B. List the possible genotypes. b. If there are 40 individuals in a population and all 40 have the genotype RB, what is the frequency of the R allele? c. If there are 40 individuals in a population and 10 are RR, 20 are RB, and 10 BB, what is the frequency of the R allele? d. If there are 40 individuals in a population and 10 are RR, 10 are RB, and 20 BB, what is the frequency of the R allele?arrow_forward
- A meadow is home to a population of plants of a particular species. Among these individuals are 125 plants that have red flowers and 375 plants that have white flowers. The allele of the flower color gene that produces red flowers (R) is completely dominant over the white flower color allele (r). Approximately what percent of the plants in the meadow would be expected to have the Rr genotype? Group of answer choices a. 23% b. 33% c. 2% d. 76%arrow_forwardA hypothetical population was found to have a genotype frequency of AA=20%, Aa=40%, aa=40%. What genotype is in short supply (that is, in less proportions than equilibrium levels)? a. Aa b. AA C. aa d. none of the abovearrow_forwardIn horses, tobiano is a white spotting pattern. The tobiano allele (T) is dominant over the non-tobiano (t) allele. In an ideal horse population exhibiting Hardy–Weinberg equilibrium, 350 horses out of 465 are non-tobiano. a. Calculate the number of homozygous dominant tobiano horses. Answer b. Calculate the number of heterozygous horses. Answer c. Calculate the number of tobiano horses in the population. Answer Express your answer rounded to the nearest whole number.arrow_forward
- A population of gophers is very isolated, so no individuals can move in/out of the population. It is very small, so random events affect allele frequencies and many traits are under strong selection. Males are chosen randomly. Which statement is correct? A. Allele frequencies in 10 generations will be different than they are today. B. Individual gophers are evolving traits they need to survive C.Genetic drift is not acting on the gophers D. The population is in Hardy-Weinberg equilibriumarrow_forwardA wildflower normally bears blue flowers. Occasionally, plants with pink flowers are observed in wild populations. Flower color is controlled at a single locus, with the pink allele completely recessive to the blue allele. In one population, 25 pink flowers and 3291 blue flowers were found. a. Calculate the expected allele frequencies and genotype frequencies if the population were in HWE. b. The mean # of pods of these plants were examined. Assume that heterozygotes are as fit as homozygous blue, and that seeds from both pink and blue all suffer about the same mortality rate after germinating. Calculate the relative fitness of each genotype. c. Predict quantitatively the effect of natural selection on the frequencies of phenotypes in the next generation. Blue: mean # of plants: 19.33 # of plants: 39 Pink: mean # of plants: 13.08 # of plants: 24arrow_forwardSuppose that in a population the frequency of a particular recessive condition is 1/400. Assume this is locus with two alleles (A and a) in the population and that the population is at Hardy–Weinberg equilibrium. What is the frequency of the carriers of this condition in the population? A. 0.9025 B. 0.0025 C. 0.05 D. 0.095 E. 0.0475arrow_forward
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