Essentials of Genetics (9th Edition) - Standalone book
9th Edition
ISBN: 9780134047799
Author: William S. Klug, Michael R. Cummings, Charlotte A. Spencer, Michael A. Palladino
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 4, Problem 18PDQ
A geneticist from an alien planet that prohibits genetic research brought with him two true-breeding lines of frogs. One frog line croaks by uttering "rib-it rib-it" and has purple eyes. The other frog line croaks by muttering "knee-deep knee-deep" and has green eyes. He mated the two frog lines, producing F1 frogs that were all utterers with blue eyes. A large F2 generation then yielded the following ratios:
27/64 blue, utterer
12/64 green, utterer
9/64 blue, mutterer
9/64 purple, utterer
4/64 green, mutterer
3/64 purple, mutterer
(a) How many total gene pairs are involved in the inheritance of both eye color and croaking?
(b) Of these, how many control eye color, and how many control croaking?
(c) Assign gene symbols for all
(d) After many years, the frog geneticist isolated true-breeding lines of all six F2 phenotypes. Indicate the F1 and F2 phenotypic ratios of a cross between a blue, mutterer and a purple, utterer.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
A geneticist from an alien planet that prohibits genetic research brought with him two true-breeding lines of frogs. One frog line croaks by uttering “rib-it rib-it” and has purple eyes. The other frog line croaks by muttering “knee-deep knee-deep” and has green eyes. He mated the two frog lines, producing F1 frogs that were all utterers with blue eyes. A large F2 generation then yielded the following ratios:
(a) How many total gene pairs are involved in the inheritance of both eye color and croaking?
(b) Of these, how many control eye color, and how many con- trol croaking?
(c) Assign gene symbols for all phenotypes, and indicate the genotypes of the P1, F1, and F2 frogs.
(d) After many years, the frog geneticist isolated true-breeding lines of all six F2 phenotypes. Indicate the F1 and F2 phenotypic ratios of a cross between a blue, mutterer and a purple, utterer.
If one human parent is heterozygous for blood type A (IAi), and the second parent is heterozygous for blood type B (IBi), what are the expected phenotypic ratios in their children?
a. 1/4 with blood type AB, 1/4 with blood type A, 1/4 with blood type B, and 1/4 with blood type O
b. 1/4 with blood type A (IAi), 1/2 with blood type AB (IAIB), and 1/4 with blood type B (IBi)
c. 1/2 with blood type AB (IAIB), and 1/2 with blood type O (ii)
d. 1/2 with blood type A (IAi), and 1/2 with blood type B (IBi)
e. 1/2 with blood type A (IAi), and 1/2 with blood type O (ii)
A true-breeding purple-leafed plant isolated from one side of El Yunque, the rain forest in Puerto Rico, was crossed to a truebreeding white variety found on the other side. The F1 offspring were all purple. A large number of F1 * F1 crosses produced the following results: purple: 4219 white: 5781 (Total = 10,000) Propose an explanation for the inheritance of leaf color. As a geneticist, how might you go about testing your hypothesis? Describe the genetic experiments that you would conduct
Chapter 4 Solutions
Essentials of Genetics (9th Edition) - Standalone book
Ch. 4 - CASE STUDY | But he isn't deaf Researching their...Ch. 4 -
CASE STUDY | But he isn’t deaf
Researching...Ch. 4 - CASE STUDY | But he isn't deaf Researching their...Ch. 4 - HOW DO WE KNOW? In this chapter, we focused on...Ch. 4 - Review the Chapter Concepts list on page 53. These...Ch. 4 - In Shorthorn cattle, coat color may be red, white,...Ch. 4 -
4. With regard to the ABO blood types in humans,...Ch. 4 - In foxes, two alleles of a single gene, P and p,...Ch. 4 - Three gene pairs located on separate autosomes...Ch. 4 - As in the plants of Problem 6, color may be red,...
Ch. 4 -
8. The following genotypes of two independently...Ch. 4 - Given the inheritance pattern of coat color in...Ch. 4 - A husband and wife have normal vision, although...Ch. 4 - In humans, the ABO blood type is under the control...Ch. 4 - In goals, development of the beard is due to a...Ch. 4 -
13. In cats, orange coal color is determined by...Ch. 4 - In Drosophila, an X-linked recessive mutation,...Ch. 4 - Another recessive mutation in Drosophila, ebony...Ch. 4 - While vermilion is X-linked in Drosophila and...Ch. 4 - In pigs, coat color may be sandy, red, or white. A...Ch. 4 - A geneticist from an alien planet that prohibits...Ch. 4 - In another cross, the frog geneticist from Problem...Ch. 4 - In cattle, coats may be solid white, solid black,...Ch. 4 - Consider the following three pedigrees, all...Ch. 4 - Labrador retrievers may be black, brown, or golden...Ch. 4 - Three autosomal recessive mutations in Drosophila,...Ch. 4 -
24. Horses can be cremello (a light cream...Ch. 4 - Pigment in the mouse is produced only when the C...Ch. 4 - Five human matings numbered 1–5 are shown in the...Ch. 4 - Two mothers give birth to sons at the same time at...Ch. 4 - In Dexter and Kerry cattle, animals may be polled...Ch. 4 - What genetic criteria distinguish a case of...Ch. 4 -
30. The specification of the anterior-posterior...Ch. 4 - The maternal-effect mutation bicoid(bcd)is...Ch. 4 -
32. Students taking a genetics exam were...Ch. 4 - In four o'clock plants, many flower colors are...Ch. 4 - Prob. 34PDQ
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- The petals of the plant Collinsia parviflora are normally blue, giving the species its common name, blue-eyed Mary. Two pure-breeding lines were obtained from color variants found in nature; the first line had pink petals, and the second line had white petals. The following crosses were made between pure lines, with the results shown: Parents F1 F2 blue × white blue 101 blue, 33 white blue × pink blue 192 blue, 63 pink pink × white blue 272 blue, 121 white, 89 pink a. Explain these results genetically. Define the allele symbols that you use, and show the genetic constitution of the parents, the F1, and the F2 in each cross. b. A cross between a certain blue F2 plant and a certain white F2 plant gave progeny of which 3 8 were blue, 1 8 were pink, and 1 2 were white. What must the genotypes of these two F2 plants have been?arrow_forwardAssume that one of the students in your class is homozygous for the “Type A” allele and the other student is homozygous for the “Type B” allele. What blood type(s) would you expect to see in their offspring? What if the second was instead “Type O”? Cross two individuals who both have Type AB blood. What are the expected genotypic and phenotypic ratios in their offspring? PTC paper placed in your mouth can determine if you are a “taster” or a “non-taster”? Let's assume that you are a "taster". What possible genotypes could produce your phenotype? If you produced children with a "non-taster", what genotypic and phenotypic ratios would be expected in your offspring?arrow_forwardIn pedigrees, individuals are usually specified by using a Roman numeral for their generation in the chart and an Arabic number for their position (reading left to right) within that generation. If we use the letter c for the allele that causes cystic fibrosis, what are the genotypes of individuals III-3 and III-4 (the third and fourth individuals shown in generation III) in the pedigree that shows this disease?arrow_forward
- You start a cross with a true-breeding red-eyed troll and a true-breeding white-eyed troll, and then cross the F1 offspring to make the F2 generation. In the F2 generation, you collect 3 red-eyed trolls, 8 white-eyed trolls, and 5 pink-eyed trolls. Use a chi-square test to evaluate whether the data matches your expectation if the trait is controlled by a single gene with incomplete dominance. In the spaces below, enter the expected number of offspring in each phenotypic group that you would use to calculate your chi square. Report your expected values to the nearest 0.01. Expected Number of Pink-eyed trolls Expected Number of Red-eyed trolls Expected Number of White-eyed trolls Calculate your chi-square test and answer the following questions: How many degrees of freedom do you have in this test Do you reject the null hypothesis? Yes or no?arrow_forwardIn Mendel’s 1866 publication as shown in Figure 1-4, he reports 705 purple-flowered (violet) offspring and 224 white-flowered offspring. The ratio he obtained is 3.15:1 for purple: white. How do you think he explained the fact that the ratio is not exactly 3:1?arrow_forwardIn corn plants, a dominant allele Z inhibits kernel color, while the recessive allele z permits color when homozygous. At a different locus, the dominant allele X causes purple kernel color, while the homozygous recessive genotype causes red kernel color. If corn plants heterozygous for both the Z and X genes are crossed, what are the chances that the offspring will have purple kernels? Enter your answer as a decimal fraction in the box (e.g. 0.25).arrow_forward
- When Mendel crossed in his P generation a yellow-seeded and green-seeded pea plants, all the offspring were yellow seeded. When he took these F1 yellow-seeded plants and crossed them with the original yellow-seeded plant from the P generation, what genotypic ratio was expected? Group of answer choices 1:2:1 3:1 1:1:1:1 1:1arrow_forwardAssume that one of the students in your class is homozygous for the “Type A” allele and the other student is homozygous for the “Type B” allele. What blood type(s) would you expect to see in their offspring? What if the second was instead “Type O”? Cross two individuals who both have Type AB blood. What are the expected genotypic and phenotypic ratios in their offspring?arrow_forwardYou breed a black homozygous mouse with a white homozygous mouse and all the F1 offspring are gray. Then you breed 2 gray mice from the F1 generation together. What are the expected phenotypic percentages of the F2 generation?arrow_forward
- In a heterzygote cross between two peas, where A is dominant and a is recessive. In a pod with 4 peas, what is the probability that 3 or more of the peas are recessive.arrow_forwardSuppose that goats have one gene that codes for color, where A is brown and a is white. The goats also have another gene that codes for height, where B is tall and b is short. If these two genes are unlinked, what is the probability that a cross between Aa Bb × Aa bb parents will produce three out of five offspring that are white and tall? Enter your answer as a decimal, rather than as a percentagearrow_forwardMendel crossed two pea plants with round seeds. All seeds of the F1 offspring were round. He then crossed an F1 plant with round seeds to a plant with wrinkled seeds and all offspring had wrinkled seeds. Finally, he intercrossed the F1 plants to produce the F2. Which of the following statements is true? Group of answer choices the trait does not breed true wrinkled is dominant; the F2 phenotypic ratio should be 3 wrinkled: 1 round wrinkled is dominant; the F2 phenotypic ratio should be 3 round: 1 wrinkled round is dominant; the F2 phenotypic ratio should be 3 round: 1 wrinkled round is dominant; the F2 phenotypic ratio should be 1 round: 2 semi-wrinkled: 1 wrinkledarrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Concepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax College
Human Biology (MindTap Course List)BiologyISBN:9781305112100Author:Cecie Starr, Beverly McMillanPublisher:Cengage Learning
Concepts of Biology
Biology
ISBN:9781938168116
Author:Samantha Fowler, Rebecca Roush, James Wise
Publisher:OpenStax College
Human Biology (MindTap Course List)
Biology
ISBN:9781305112100
Author:Cecie Starr, Beverly McMillan
Publisher:Cengage Learning
Mitochondrial mutations; Author: Useful Genetics;https://www.youtube.com/watch?v=GvgXe-3RJeU;License: CC-BY