In a plant, a tall variety was crossed with a dwarf variety. All F1 plants were tall. When F1 * F1 plants were interbred, 9/16 of the F2 were tall and 7/16 were dwarf. (a) Explain the inheritance of height by indicating the number of gene pairs involved and by designating which genotypes yield tall and which yield dwarf. (Use dashes where appropriate.) (b) What proportion of the F2 plants will be true breeding if selffertilized? List these genotypes.

In a plant, a tall variety was crossed with a dwarf variety. All F1 plants were tall. When F1 * F1 plants were interbred, 9/16 of the F2 were tall and 7/16 were dwarf. (a) Explain the inheritance of height by indicating the number of gene pairs involved and by designating which genotypes yield tall and which yield dwarf. (Use dashes where appropriate.) (b) What proportion of the F2 plants will be true breeding if selffertilized? List these genotypes.

Name: In a plant, a tall variety was crossed with a dwarf variety. All F1 pl
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Description: In a plant, a tall variety was crossed with a dwarf variety. All F1 plants were tall. When F1 * F1 plants were interbred, 9/16 of the F2 were tall and 7/16 were dwarf. (a) Explain the inheritance of height by indicating the number of gene pairs invol

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter8: Patterns Of Inheritance

Section: Chapter Questions

Problem 2ACQ: Figure 8.10 In pea plants, purple flowers (P) are dominant to white (p), and yellow peas (Y) are...

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Figure 8.10 In pea plants, purple flowers (P) are dominant to white (p), and yellow peas (Y) are dominant to green (y). What are the possible genotypes and phenotypes for a cross between PpYY and ppYy pea plants? How many squares would you need to complete a Punnett square analysis of this cross?
In the tomato, yellow flowers (Y) is dominant to white flowers (y). A true-breeding yellow flowered strain is crossed with a true-breeding white flowered strain.A. If the F1 generation is self crossed, what will be the genotypes and phenotypes of the progeny and in what portions are they expected? B. If an F1 plant were crossed with a plant from true-breeding white flowered strain, what will be the genotypes and phenotypes of the progeny and in what portions are they expected?
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In snapdragons, red flower color (R) is incompletely dominant over white flower color (r), so that the heterozygote has pink flowers. A red snapdragon is crossed with a white snapdragon, and the F1 are intercrossed to produce F2. What is the genotype and phenotypes of the F1 and F2, along with their expected proportions? If the F1 are backcrossed to the white parent, what will be the expected genotype and phenotype of the offspring? If the F1 are backcrossed to the red parent and the resulting progeny are intercrossed, what is the expected proportions of genotypes and phenotypes in the progeny?
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In pea plants, the "L" allele, which indicates smooth seeds, is dominant over the "l" allele, which indicates rough seeds, and the "A" allele, which indicates yellow color, is dominant over the "a" allele, which indicates green color. If a yellow smooth pure variety is crossed with a green wrinkled pure variety. • What is the genotype and phenotype of the first filial generation (F1)? • Indicate the phenotypes of the second generation (F2) and the proportion of each of them that results from the self-fertilization of F1 plants.
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In oats, the color of the chaff is determined by a two-gene interaction. When a true-breeding black chaff plant was crossed to a truebreeding white chaff plant, the F1 generation was composed of allblack chaff plants. When the F1 offspring were crossed to eachother, the ratio produced was 12 black to 3 gray to 1 white. First,construct a Punnett square that accounts for this pattern of inheritance. Which genotypes produce the gray chaff phenotype? Second,at the level of protein function, how would you explain this type ofinheritance?
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