Genetic Analysis: An Integrated Approach (3rd Edition)
3rd Edition
ISBN: 9780134605173
Author: Mark F. Sanders, John L. Bowman
Publisher: PEARSON
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Chapter 2, Problem 38P
Sweet yellow tomatoes with a pear shape bring a high price per basket to growers. Pear shape, yellow color, and terminal flower position are recessive traits produced by alleles f, r, and t, respectively. The dominant
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Please solve this problem using the test cross branch diagram without a punnet square.
The best way to determine the genotype for a plant presenting with dominant phenotypes is by performing a test cross. Test crosses are always performed with a true-breeding plant with recessive traits. What would be the phenotype and genotype of the plant you would need to perform the test-cross with your tall, purple plant?After performing the test-cross with your unknown purple, tall plant you find that all your resulting plants are tall; half have white flowers, and half have purple flowers. What was the genotype of your original purple, tall plant?
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9/64
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Chapter 2 Solutions
Genetic Analysis: An Integrated Approach (3rd Edition)
Ch. 2 -
1. Compare and contrast the following terms:
a....Ch. 2 - For the cross , what is the expected genotype...Ch. 2 - 37. Galactosemia is an autosomal recessive...Ch. 2 - In mice, black coat color is dominant to white...Ch. 2 - Two parents plan to have three children. What is...Ch. 2 - Consider the cross AaBbCCAABbCc. a. How many...Ch. 2 - If a chi-square test produces a chi-square value...Ch. 2 -
8. Determine whether the statements below are...Ch. 2 - In the datura plant, purple flower color is...Ch. 2 - 10. The dorsal pigment pattern of frogs can be...
Ch. 2 - 11. Black skin color is dominant to pink skin...Ch. 2 - A male mouse with brown fur color is mated to two...Ch. 2 - 13. Figure 2.12 shows the results of Mendel’s...Ch. 2 - 14. An experienced goldfish breeder receives two...Ch. 2 -
15. The accompanying pedigree shows the...Ch. 2 -
16. A geneticist crosses a pure-breeding strain...Ch. 2 - Suppose an F1 plant from Problem 16 is crossed to...Ch. 2 - 18. In pea plants, the appearance of flowers along...Ch. 2 - 19. If two six-sided dice are rolled, what is the...Ch. 2 - Experimental Insight 2.1 describes data, collected...Ch. 2 -
21. The accompanying pedigree shows the...Ch. 2 - 22. The seeds in bush bean pods are each the...Ch. 2 - List all the different gametes that are possible...Ch. 2 - Organisms with the genotypes AABbCcDd and AaBbCcDd...Ch. 2 - 25. Blue moon beans produce beans that are either...Ch. 2 - In the fruit fly Drosophila, a rudimentary wing...Ch. 2 - In pea plants, plant height, seed shape, and seed...Ch. 2 - A variety of pea plant called Blue Persian...Ch. 2 - 29. In tomato plants, the production of red fruit...Ch. 2 - A male and a female are each heterozygous for both...Ch. 2 - A woman expressing a dominant phenotype is...Ch. 2 - Two parents who are each known to be carriers of...Ch. 2 - 33. An organism having the genotype AaBbCcDdEe is...Ch. 2 - 34. A man and a woman are each heterozygous...Ch. 2 - For a single dice roll, there is a 16 chance that...Ch. 2 - You have four guinea pigs for a genetic study. One...Ch. 2 - 37. Galactosemia is an autosomal recessive...Ch. 2 - Sweet yellow tomatoes with a pear shape bring a...Ch. 2 - A cross between a spicy variety of Capsicum annum...Ch. 2 - Alkaptonuria is an infrequent autosomal recessive...Ch. 2 - 41. Humans vary in many ways from one another....Ch. 2 - 42. In chickens, the presence of feathers on the...Ch. 2 -
43. A pure-breeding fruit fly with the...Ch. 2 - 44. Situs inversus is a congenital condition in...Ch. 2 - 45. Domestic dogs evolved from ancestral grey...Ch. 2 - Alleles of the IGF-1 gene in dogs, encoding...Ch. 2 - 47. The accompanying pedigree shows a family in...Ch. 2 -
48. A pea plant that has the genotype RrGgwwdd is...Ch. 2 - Go to the OMIM website...Ch. 2 - Prob. 50PCh. 2 - Prob. 51PCh. 2 -
52. In humans, the ability to bend the thumb...
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- In com, colored aleurone (in the kernels) is due to the dominant allele R. The recessive allele r, when homozygous, produces colorless aleurone. The plant color (not the kernel color) is controlled by another gene with two alleles Y and y. The dominant Y allele results in green color, whereas the homozygous presence of the recessive y allele causes the plant to appear yellow. In a testcross between a plant of unknown genotype and phenotype and a plant that is homozygous recessive for both traits, the following progeny were obtained. Numbers of Offspring Phenotype Colored Aleurone & Green Plant 88 Colored Aleurone & Yellow Plant 12 Colorless Aleurone & Green Plant 8 Colorless Aleurone & Yellow Plant 92 Question: Determine the genotype and phenotype of the unknown plant, including the precise association of the two genes on the homologs (i.e. the map arrangement)arrow_forwardIn tomatoes, red fruit is dominant over yellow, two-loculed fruit is dominant over many-loculed fruit, and tallvine is dominant over dwarf. A breeder has two purelines: (1) red, two-loculed, dwarf and (2) yellow, manyloculed, tall. From these two lines, he wants to produce anew pure line for trade that is yellow, two-loculed, andtall. How exactly should he go about doing so? Show notonly which crosses to make, but also how many progenyshould be sampled in each case.arrow_forwardIn garden pea plants, tall stem height (T) is dominant over short stem height (t), and green pod colour (G) is dominant over yellow pod colour (g). Some Genotypes of Pea Plants TTGG TTGg TTgg TtGG TtGg Ttgg ttGG ttGg ttgg Identify the correct genotypes listed above for the pea plant phenotypes described below. Phenotype Number Pure breeding tall, green pod pea plant Answer Pea plant used for a test cross Answer Heterozygous tall and green pod pea plant Answer Yellow pod heterozygous tall pea plant Answerarrow_forward
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- Plant height is controlled by 5 gene pairs. The homozygous dominant is 200 cm tall while the homozygous recessive exhibits 80 cm height. Assume that the alleles have equal contribution and have cumulative effects. The F1 and F2 of the two parents below were studied. Parent 1 Parent 2 DID,D2D2D3D3dąd, dsds dıdıd2d2d3d3DąD4 D5D5 a. Compute for the contribution of the dominant allele. b. Compute for the height of parent 1 and parent 2. Provide the genotype and phenotype of the F1. d. Compute for the frequencies of the different individuals in the F2 using the Pascal's triangle. e. Provide the phenotypes of the F2 and their frequencies. С.arrow_forwardIn roses, red petals (r) and waxy texture (wx) are encoded by two mutant alleles that are recessive to those that produce wild-type traits; yellow petals (r+) and soft texture (wx+). A rose homozygous for red petals and waxy texture is crossed to a rose homozygous for the wild-type traits. The F1 have yellow petals and soft texture. The F1 are crossed with roses that have red petals and waxy texture in a testcross. The progeny of this testcross are (1000 total): Yellow petals, soft texture 300 Yellow petals, waxy texture 126 Red petals, soft texture 110 Red petals, waxy texture 464 What is the genetic distance between red petals and waxy texture? a.57.4 b.76.4 c.23.6 d.30.9 e.42.6arrow_forward(b) A plant breeder wants to use selective breeding to produce corn with short stalKS and a high mass of grain. He could use the following varieties of com: varlety A varlety B varlety C long stalks short stalks long stalks high mass of grain low mass of grain low mass of grain (i) What would the plant breeder need to do to make sure he always produced corn with short stalks and a high mass of grain? Describe the three steps the breeder would use. (ii) Suggest one other characteristic that famers might like corn plants to have to increase the amount of corn produced.arrow_forward
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