. In corn, three dominant alleles, called A, C, and R,must be present to produce colored seeds. GenotypeA/− ; C/− ; R/− is colored; all others are colorless.A colored plant is crossed with three tester plants ofknown genotype. With tester a/a ; c/c ; R/R, the coloredplant produces 50 percent colored seeds; with a/a ;C/C ; r/r, it produces 25 percent colored; and withA/A ; c/c ; r/r, it produces 50 percent colored. What isthe genotype of the colored plant?

. In corn, three dominant alleles, called A, C, and R,must be present to produce colored seeds. GenotypeA/− ; C/− ; R/− is colored; all others are colorless.A colored plant is crossed with three tester plants ofknown genotype. With tester a/a ; c/c ; R/R, the coloredplant produces 50 percent colored seeds; with a/a ;C/C ; r/r, it produces 25 percent colored; and withA/A ; c/c ; r/r, it produces 50 percent colored. What isthe genotype of the colored plant?

Name: . In corn, three dominant alleles, called A, C, and R,must be present
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Description: . In corn, three dominant alleles, called A, C, and R,must be present to produce colored seeds. GenotypeA/− ; C/− ; R/− is colored; all others are colorless.A colored plant is crossed with three tester plants ofknown genotype. With tester a/a ; c/c ;

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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Sunflowers with flowers 10 cm in diameter are crossed with a plant that has 20-cm flowers. The F1 plants have flowers 15 cm in diameter. In the F2 generation, 4 flowers are 10 cm in diameter and 4 are 20 cm in diameter. Between these are 5 phenotypic classes with diameters intermediate to those at the extremes. a. Assuming that the alleles that contribute to flower diameter act additively, how many genes control flower size in this strain of sunflowers? b. How much does each additive allele contribute to flower diameter? c. What size flower makes up the largest phenotypic class?
Colored aleurone in the kernels of corn 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: colored, green 88 colored, yellow 12 colorless, green 8 colorless, yellow 92 Explain how these results were obtained by determining the exact genotype and phenotype of the unknown plant, including the precise arrangement of the alleles on the homologs.
Pea PlantsIn pea plants, a round-seed shape (R) is dominant over a wrinkled-seed shape (r). A round-seeded pea plant was crossed with another round-seeded pea plant. What are the genotype(s) and phenotype(s) ratios of the F1 generation? Show all possibilities using Punnett squares. State the F1 generation genotypes and phenotypes.
In corn, the genes for tassel length (alleles T and t) andrust resistance (alleles R and r) are known to be on separate chromosomes. In the course of making routinecrosses, a breeder noticed that one T/t ; R/r plant gaveunusual results in a testcross with the double-recessivepollen parent t/t ; r/r. The results wereProgeny: T/t ; R/r 98t/ t ; r/r 104T/t ; r/r 3t/t ; R/r 5Corncobs: Only about half as many seeds as usuala. What key features of the data are different from theexpected results?b. State a concise hypothesis that explains the results.c. Show genotypes of parents and progeny.d. Draw a diagram showing the arrangement of alleleson the chromosomes.e. Explain the origin of the two classes of progenyhaving three and five members.
Calculate the probability of either all-dominant or all-recessive genotypes for the alleles A, B, E, and F in the following cross: A/a;B/b;c/c;d/d;E/e;F/fx A/a;B/b;C/c;d/d;E/e;F/f 1/64 1/128 1/256 1/32 1/16
Colored aleurone in the kernels of corn is due to the dominant allele R. The recessive allele r, when homozygous, produces colorless aleurone. The plant color (not 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: colored, green 88colored, yellow 12colorless, green 8colorless, yellow 92Explain how these results were obtained by determining theexact genotype and phenotype of the unknown plant, including the precise association of the two genes on the homologs (i.e., the arrangement).
In pigs, the dominant C allele produces a curly tail. c/c homozygotes have straight tails. The recessive w allele produces white hair, whereas the W allele produces brown hair. The C and W genes (loci) are on the same chromosome. A C W / c w heterozygote (curly, brown) is test crossed to a c w / c w (straight, white) homozygote multiple times. They produce a total of 100 progeny, of which 20 have curly tails and white hair. What is the distance between the C and W loci, in map units? A.10 B. 20 C. 30 D.40
In tomatoes, red fruit color (R) is dominant over yellow fruit color (r). Do the following crosses: Rr x rr Rr x RR rr x RR Rr x Rr rr x Rr rr x rr Show your Punnett square for each cross. For each cross also show the genotypic and phenotypic ratios.
Tallness (T) in a certain plant is dominant to short (t), while red (R) flower color is dominant to yellow (r). The heterozygous condition results in orange (Rr) flower color. A short plant with red flowers, is crossed with a plant homozygous for tallness and yellow flowers. What would be the genotype and phenotype of the F1 individuals? ttRr—short and orange ttrr—short and yellow TtRr—tall and red Ttrr—tall and yellow TtRr—tall and orange
In corn, a colored aleurone is due to the presence of an R allele; r/r is colorless. Another gene controls the color of the plant, with g/g being yellow and G_being green. A plant of unknown genotype is test-crossed, and the following progeny plants were obtained. Colored green 89 Colored yellow 13 Colorless green 9 Colorless yellow 92 What was the phenotype and genotype of the plant used for the test cross? A. Colorless green - rG/rg B. Colorless yellow - rg/rg C. Colored yellow - Rg/rg D. Colored green - RG/rg
In peas, the yellow allele is dominant over the green allele. A plant with yellow peas was crossed to a plant with green peas. The resulting plants were 50% yellow and 50% green. What is the genotype of the parents in this cross? G/g xg/g OG/G x G/g G/Gxg/g Og/g *g/g OG/g x G/g
A is dominant over a and B is dominant over b. Genes A/a and B/b assort independently. The parental cross (P) is between true- breeding (homozygous) strains (AA bb x aa BB). The resulting F1 offspring would be [Select ] A F1 x F1 cross gives the F2 generation. The ratio of phenotypes in the F2 generation can be described as [ Select ] In the phenotypic ratio, what number refers to individuals that are: dominant for both traits? [ Select ] recessive for both traits? [Select ] To what phenotypes do the "3"s in the ratio refer? [ Select ] > >