Two true-breeding white strains of the plantIllegitimati noncarborundum were mated, and theF1 progeny were all white. When the F1 plants wereallowed to self-fertilize, 126 white-flowered and33 purple-flowered F2 plants grew.a. How would you describe inheritance of flowercolor? Describe how specific alleles influence eachother and therefore affect phenotype.b. A white F2 plant is allowed to self-fertilize. Ofthe progeny, 3/4 are white-flowered, and 1/4 are purple-flowered. What is the genotype of the whiteF2 plant?c. A purple F2 plant is allowed to self-fertilize. Of theprogeny, 3/4 are purple-flowered, and 1/4 arewhite-flowered. What is the genotype of the purpleF2 plant?d. Two white F2 plants are crossed with each other.Of the progeny, 1/2 are purple-flowered, and 1/2are white-flowered. What are the genotypes of thetwo white F2 plants?

Two true-breeding white strains of the plantIllegitimati noncarborundum were mated, and theF1 progeny were all white. When the F1 plants wereallowed to self-fertilize, 126 white-flowered and33 purple-flowered F2 plants grew.a. How would you describe inheritance of flowercolor? Describe how specific alleles influence eachother and therefore affect phenotype.b. A white F2 plant is allowed to self-fertilize. Ofthe progeny, 3/4 are white-flowered, and 1/4 are purple-flowered. What is the genotype of the whiteF2 plant?c. A purple F2 plant is allowed to self-fertilize. Of theprogeny, 3/4 are purple-flowered, and 1/4 arewhite-flowered. What is the genotype of the purpleF2 plant?d. Two white F2 plants are crossed with each other.Of the progeny, 1/2 are purple-flowered, and 1/2are white-flowered. What are the genotypes of thetwo white F2 plants?

Name: Two true-breeding white strains of the plantIllegitimati noncarborundu
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Description: Two true-breeding white strains of the plantIllegitimati noncarborundum were mated, and theF1 progeny were all white. When the F1 plants wereallowed to self-fertilize, 126 white-flowered and33 purple-flowered F2 plants grew.a. How would you describe

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 5RQ: Imagine that you are performing a cross involving seed texture in garden pea plants. You cross...

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A rooster with a particular comb morphology calledwalnut was crossed to a hen with a type of comb morphology known as single. The F1 progeny all had walnut combs. When F1 males and females were crossedto each other, 93 walnut and 11 single combs wereseen among the F2 progeny, but there were also29 birds with a new kind of comb called rose and32 birds with another new comb type called pea.a. Explain how comb morphology is inherited.b. What progeny would result from crossing a homozygous rose-combed hen with a homozygouspea-combed rooster? What phenotypes and ratioswould be seen in the F2 progeny?c. A particular walnut rooster was crossed to a peahen, and the progeny consisted of 12 walnut,11 pea, 3 rose, and 4 single chickens. What are thelikely genotypes of the parents?d. A different walnut rooster was crossed to a rosehen, and all the progeny were walnut. What are thepossible genotypes of the parents?
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?
In certain cactus, prickly spines can be two-pronged or one-pronged. If a homozygous one-pronged cactus is crossed with a homozygous two-pronged cactus, the F1 generation has a mixture of spines (some are two-pronged, some are one-pronged). a. What are the genotypes of the parents and F1s?b. What mode of inheritance is exhibited? c. If the F1s were crossed, what proportion of the F2s will have genotypes like their parents?
You self-fertilize an F1 plant to produce the F2 generation. Based on Mendelian principles of inheritance, what fraction of the F2 generation do you expect to be short with round, green seeds? HINT: Solving this problem will require a very large Punnett square (8 x 8), but you can easily solve it using the Multiplication Rule
Assume that the trihybrid cross AABBrr x aabbRR is made in a plant species. Assume that A and B are dominant alleles, but there is no dominance effect of alleles at the R locus. a) How many different gametes are possible in the F1generation? What are the genotypes of these gametes? b) What is the probability of the parental aabbRR genotype in the F2 progeny? c) What proportion of the F2 progeny would be expected to be homozygous for all three genes?
In tomatoes, tall (D) is dominant over dwarf (d) and smooth fruit (P) is dominant over pubescent fruit (p), which is covered with fine hairs. A farmer has two tall and smooth tomato plants, which we will call plant A and plant B. The farmer crosses plants A and B with the same dwarf and pubescent plant and obtains the following numbers of progeny: Q. Explain why different proportions of progeny are produced when plant A and plant B are crossed with the same dwarf pubescent plant.
In chickens, the Leghorn variety has white feathers due to an autosomal dominant allele. Silkies have white feathers due to a recessive allele in a second (different) gene. If a true-breeding whiteLeghorn is crossed to a true-breeding white Silkie, what is theexpected phenotype of the F1 generation? If members of the F1generation are mated to each other, what is the expected phenotypic ratio of the F2 generation? Assume the chickens in the parental generation are homozygous for the white allele at one gene andhomozygous for the brown allele at the other gene. In subsequentgenerations, nonwhite birds will be brown.
A pea plant that is dwarf with green, wrinkled seeds was crossedto a true-breeding plant that is tall with yellow, round seeds. TheF1 generation was allowed to self-fertilize. What types of gametes,and in what proportions, would the F1 generation make? Whatwould be the ratios of genotypes and phenotypes of the F2generation?
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In corn, seedling color is determined by genes at two loci (C/c and D/d). Suppose that you cross a pure-breeding green seedling with a pure-breeding yellow seedling and obtain only green seedlings in the F1 generation. You then cross two of the F1 seedlings and obtain the following progeny for the F2 generation: 138 green seedlings, 33 virescent-white seedlings, and 10 yellow seedlings. What form of epistasis would explain these data?