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. These genes have a rate of recombination of 12%. What is the predicted frequency of colorless and yellow offspring when a Rg/rG is test-crossed? A. 0.88 B. 0.44 C. 0.04 D. 0.12 E. 0.06

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. These genes have a rate of recombination of 12%. What is the predicted frequency of colorless and yellow offspring when a Rg/rG is test-crossed? A. 0.88 B. 0.44 C. 0.04 D. 0.12 E. 0.06

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 4RQ: Imagine that you are performing a cross involving seed color in garden pea plants. What traits would...

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In a species of the cat family, eye color can be gray, blue, green, or brown, and each trait is true breeding. In separate crosses involving homozygous parents, the following data were obtained: Cross P1 F1 F2 A green * gray all green 3/4 green: 1/4 gray B green * brown all green 3/4 green: 1/4 brown C gray * brown all green 9/16 green: 3/16 brown 3/16 gray: 1/16 blue (a) Analyze the data. How many genes are involved? Define gene symbols and indicate which genotypes yield each phenotype. (b) In a cross between a gray-eyed cat and one of unknown genotype and phenotype, the F1 generation was not observed. However, the F2 resulted in the same F2 ratio as in cross C. Determine the genotypes and phenotypes of the unknown P1 and F1 cats.
A dark-red strain and a white strain of wheat are crossed and produce an intermediate, medium-red F1. When the F1 plants are interbred, an F2 generation is produced in a ratio of 1 dark-red: 4 medium-darkred: 6 medium-red: 4 light-red: 1 white. Further crosses reveal that the dark-red and white F2 plants are true breeding. (a) Based on the ratios in the F2 population, how many genes are involved in the production of color? (b) How many additive alleles are needed to produce each possible phenotype? (c) Assign symbols to these alleles, and list possible genotypes that give rise to the medium-red and light-red phenotypes. (d) Predict the outcome of the F1 and F2 generations in a cross between a true-breeding medium-red plant and a white plant
Two true-breeding varieties of maize, one 11 cm high and the other 47 cm high were crossed and the resultant F1 hybrids were then crossed to generate the F2 . In the F2 there were a total of 13,923 plants with a continuous variation in heights between the two extremes and with only 3 plants as large as 47 cm high and 5 plants of 11 cm high. b) What is the contribution of each dominant allele to the phenotype in cm? d) The F1 from (b) is then crossed to give an F2. What proportion would you expect in the F2 of each extreme phenotype?
A tall pea plant with purple flowers (both determined by dominant alleles) is crossed with a short plant with white flowers. there is no linkage of genes. if the tall, purple-flowered plant is heterozygous for both traits, the offspring will be: A 1 purple tall:1 white short B 3 purple tall:1 white short C 9 purple tall:3 purple short:3 white tall:1 white short D 1 purple tall:1 purple short:1 white tall:1 white short
Consider a situation where F1 is backcrossed with one of its parental lineage and we obtained A1H1/A2H2 : A2H1/A2H2 : A2H2/A2/H2: A1H2/A2H2 = 295 : 186 : 310 : 209, where A1 and A2 are alleles at a locus and H1 and H2 are alleles at the other locus. What is the recombination (genetic) distance between the two loci in centimorgans? A. 8.9 B. 22.5 C. 18.4 D. 50 E. 39.5
Imagine that you are performing a cross involving seed texture in garden pea plants. You cross true-breeding round and wrinkled parents to obtain F1 offspring. Which of the following experimental results in terms of numbers of plants are closest to what you expect in the F2 progeny? a. 8lOroundseeds b. 8lOwrinkledseeds c. 405:395 round seeds:wrinkled seeds d. 610:190 round seeds:wrinkled seeds
Imagine that you are performing a cross involving seed color in garden pea plants. What traits would you expect to observe in the F1 offspring if you cross true-breeding parents with green seeds and yellow seeds? Yellow seed color is dominant over green. a. only yellow-green seeds b. only yellow seeds c. 1:1 yellow seeds:green seeds d. 1:3 green seeds:yellow seeds
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Hibiscus plants have different varieties of flowers. In an instance, both the red and white flowers showed that they are incompletely dominant with each other. If the flowers that were produced in the Hibiscus experiment was cross bred with each other, what is the ratio of their genotype? Explain. A) 1:3 B) 1:1:1:1 C) 1:2:1 D) 2:2
A pea plant is heterozygous for seed shape and homozygous dominant for seed color. It was crossed with a plant with the same traits. R is the allele for round seed; r is the allele for wrinkled seed. y is the allele for green seed color. Solve the following: GR: PR: Probability:
In guinea pigs, black coat color, B, is dominant to albino, b. Rough coat, R, is dominant to smooth coat, r. Two animals are selected for breeding. Their genotypes are BBRR and bbrr. Specify the expected genotypic and phenotypic ratio in the following crosses. a. In the F1 generation b. In the F2 generation c. Among the offspring produced from crossing one of the F1 pigs having the genotype BBRr.
In analyzing the results of a three-point testcross, a student determines that the interference is −0.23. What does this negative interference value indicate? a. Fewer double crossovers took place than expected on the basis of single-crossover frequencies. b. More double crossovers took place than expected on the basis of single-crossover frequencies. c. Fewer single crossovers took place than expected. d. A crossover in one region interferes with additional crossovers in the same region.