A, B, and C genes are linked with B in the middle. AB are 8 cM and BC are 14 cM apart. If ABc/abC is testcrossed to abc/abc, what is the expected number of individuals of Aa bb Cc genotype if 1000 progeny result from this testcross with a coefficient of coincidence (C) of 0.36? A. About 11. B. About 38. C. About 68. D. About 76. E. About 138. I know the answer is B, but I don't know why, please explain!

A, B, and C genes are linked with B in the middle. AB are 8 cM and BC are 14 cM apart. If ABc/abC is testcrossed to abc/abc, what is the expected number of individuals of Aa bb Cc genotype if 1000 progeny result from this testcross with a coefficient of coincidence (C) of 0.36? A. About 11. B. About 38. C. About 68. D. About 76. E. About 138. I know the answer is B, but I don't know why, please explain!

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...

See similar textbooks

Similar questions

CC DD and cc dd individuals were crossed to eachother, and the F1 generation was backcrossed to thecc dd parent. 997 Cc Dd, 999 cc dd, 1 Cc dd, and 3 ccDd offspring resulted.a. How far apart are the c and d loci?b. What progeny and in what frequencies would youexpect to result from testcrossing the F1 generationfrom a CC dd × cc DD cross to cc dd?c. In a typical meiosis, how many crossovers occurbetween genes C and D?d. Assume that the C and D loci are on the samechromosome, but the offspring from the testcrossdescribed in part (b) were 498 Cc Dd, 502 cc dd,504 Cc dd, and 496 cc Dd. How would your answer to part (c) change?
During a dihybrid cross involving two linked genes (two-point testcross), 20 flies showed recombinant phenotypes, whereas 480 flies showed the parental phenotypes. How far apart are these linked genes from each other? a. 20 cM b. 7.5 cM c. 4 cM d. 0.04 cM e. 8 cM
The cross GE/ge × ge/ge produces the following progeny: GE/ge 80 ge/ge 90 gE/ge 15Ge/ge 20From these data, one can conclude that the recombination frequency between the G and E loci is __________%. A. 39.02 B. 17.07 C. 9.75 D. 82.92 E. 7.32
What is the probability of an offspring with the genotype DD Ee FF_ from the cross of these parents: DD Ee Ff Gg × DD Ee FFGg the correct answer is c please expl
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
Based on the ideas proposed by Morgan, which of the followingstatements concerning linkage is not true?a. Traits determined by genes located on the same chromosome arelikely to be inherited together.b. Crossing over between homologous chromosomes can create newallele combinations.c. A crossover is more likely to occur in a region between two genesthat are close together than in a region between two genes that arefarther apart.d. The probability of crossing over depends on the distance betweenthe genes.e. Genes that tend to be transmitted together are physically located onthe same chromosome
Genes A and B are 10 cM apart. A third gene D is 17 cM away from A and 7 cM away from B. An aabbDD individual is crossed with an AABBdd individual. That F1 is crossed with recessive organisms for all genes (test cross). Assuming no double crossover occurs, what percent of the F2 would you expect from the ddAaBb genotype? Select one: a. 41.5% b. 0% c. 100% d. 7% e. 83%
If a cross produced a progeny population of 900 plants that consists of 258 with white flowers and 642 with purple flowers, which of the following is most likely? P = purple, p = white. A. They deviated from a 3:1 ratio because of epistasis. B. They are the progeny of a cross in which one parent was PP and the other was Pp. C. P is clearly semi-dominant. D. The purple phenotype is co-dominant with white E. They resulted from a cross in which the parents were of identical genotype at the P locus.
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
a. 1 dominant allele will contribute 120/10 = 12 cm to the base height of the plant.b. The height of the parent plant 1 Genotype of the parent plant 1 – D1D1D2D2D3D3d4d4d5d5 The height of the parent plant 2 Genotype of the parent plant 2 – d1d1d2d2d3d3D4D4D5D5Contributing alleles – D4D4D5D5. The height of the plant without any contributing alleles would be 80 cm. The plant with genotype d1d1d2d2d3d3D4D4D5D5 has 4 contributing allele each of which contributes 12 cm to the base. Hence, the height of the plant with genotype d1d1d2d2d3d3D4D4D5D5 would be 80 + 12 + 12 + 12 + 12 = 128 cm. c. Parents – D1D1D2D2D3D3d4d4d5d5 × d1d1d2d2d3d3D4D4D5D5 Gametes – D1D2D3d4d5 × d1d2d3D4D5 F1 generation – D1d1D2d2D3d3D4d4D5d5 The height of the plants of F1 generation = 80 + 12 + 12 + 12 + 12 + 12 = 140 cm Hence, Genotype of the F1 = D1d1D2d2D3d3D4d4D5d5 Phenotype of…
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.
A poultry grower has 2 breeds of chicken, averaging 9 and 5 lbs. inweight. The F1 of the cross between is quite uniform, averaging 7lbs. Of the F2 progeny, 0.4% is as heavy as either parent. a. How much does each effective allele contribute to weight? b. What is the number of polygenes pairs involved in thesecrosses? c. If only those with an average weight of 6-8 lbs. are marketable, whatpercentage of the offspring will yield profit for the grower?