Two genes, designated A and B, are located 10 mu from each other.A third gene, designated C, is located 15 mu from B and 5 mufrom A. The parental generation consisting of AA bb CC and aaBB cc individuals were crossed to each other. The F1 heterozygoteswere then testcrossed to aa bb cc individuals. If we assume nodouble crossovers occur, what percentage of offspring would youexpect with the following genotypes?A. Aa Bb CcB. aa Bb CcC. Aa bb cc

Two genes, designated A and B, are located 10 mu from each other.A third gene, designated C, is located 15 mu from B and 5 mufrom A. The parental generation consisting of AA bb CC and aaBB cc individuals were crossed to each other. The F1 heterozygoteswere then testcrossed to aa bb cc individuals. If we assume nodouble crossovers occur, what percentage of offspring would youexpect with the following genotypes?A. Aa Bb CcB. aa Bb CcC. Aa bb cc

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Description: Two genes, designated A and B, are located 10 mu from each other.A third gene, designated C, is located 15 mu from B and 5 mufrom A. The parental generation consisting of AA bb CC and aaBB cc individuals were crossed to each other. The F1 heterozygot

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter11: The Basic Principles Of Heredity

Section: Chapter Questions

Problem 11TYU: Individuals of genotype AaBb were mated to individuals of genotype aabb. One thousand offspring were...

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Individuals of genotype AaBb were mated to individuals of genotype aabb. One thousand offspring were counted, with the following results: 474 Aabb, 480 aaBb, 20 AaBb, and 26 aabb. What type of cross is it? Are these loci linked? What are the two parental classes and the two recombinant classes of offspring? What is the percentage of recombination between these two loci? How many map units apart are they?
In most two-factor crosses involving linked genes, we cannot tellif a double crossover between the two genes has occurred becausethe offspring will inherit the nonrecombinant pattern of alleles.How does the inability to detect double crossovers affect thecalculation of map distance? Is map distance underestimated oroverestimated because of our inability to detect double crossovers?Explain your answer.
A true-breeding pea plant with round and green seeds was crossedto a true-breeding plant with wrinkled and yellow seeds. Roundand yellow seeds are the dominant traits. The F1 plants wereallowed to self-fertilize. What are the following probabilities forthe F2 generation?A. An F2 plant with wrinkled, yellow seeds.B. Three out of three F2 plants with round, yellow seeds.C. Five F2 plants in the following order: two have round, yellowseeds; one has round, green seeds; and two have wrinkled,green seeds.D. An F2 plant will not have round, yellow seeds
. A geneticist mapping the genes A, B, C, D, and E makestwo 3-point testcrosses. The first cross of pure lines isA/A ⋅ B/B ⋅ C/C ⋅ D/D ⋅ E/E × a/a ⋅ b/b ⋅ C/C ⋅ d/d ⋅ E/EThe geneticist crosses the F1 with a recessive tester andclassifies the progeny by the gametic contribution ofthe F1:A ⋅ B ⋅ C ⋅ D ⋅ E 316a ⋅ b ⋅ C ⋅ d ⋅ E 314A ⋅ B ⋅ C ⋅ d ⋅ E 31a ⋅ b ⋅ C ⋅ D ⋅ E 39A ⋅ b ⋅ C ⋅ d ⋅ E 130a ⋅ B ⋅ C ⋅ D ⋅ E 140A ⋅ b ⋅ C ⋅ D ⋅ E 17a ⋅ B ⋅ C ⋅ d ⋅ E 131000The second cross of pure lines is A/A • B/B • C/C • D/D •E/E × a/a • B/B • c/c • D/D • e/e.The geneticist crosses the F1 from this cross with arecessive tester and obtainsA ⋅ B ⋅ C ⋅ D ⋅ E 243a ⋅ B ⋅ c ⋅ D ⋅ e 237A ⋅ B ⋅ c ⋅ D ⋅ e 62a ⋅ B ⋅ C ⋅ D ⋅ E 58A ⋅ B ⋅ C ⋅ D ⋅ e 155a ⋅ B ⋅ c ⋅ D ⋅ E 165a ⋅ B ⋅ C ⋅ D ⋅ e 46A ⋅ B ⋅ c ⋅ D ⋅ E 341000The geneticist also knows that genes D and E assortindependently.a. Draw a map of these genes, showing distances inmap units wherever possible.b. Is there any evidence of interference?
We have dealt mainly with only two genes, but the sameprinciples hold for more than two genes. Consider thefollowing cross:A/a ; B/b ; C/c ; D/d ; E/e × a/a ; B/b ; c/c ; D/d ; e/ea. What proportion of progeny will phenotypicallyresemble (1) the first parent, (2) the second parent,(3) either parent, and (4) neither parent?b. What proportion of progeny will be genotypically thesame as (1) the first parent, (2) the second parent,(3) either parent, and (4) neither parent?Assume independent assortment.
If the white-flowered parental variety in Figure 1-3 werecrossed to the first-generation hybrid plant in that figure,what types of progeny would you expect to see and inwhat proportions?
. What is the probability of producing a child that willphenotypically resemble either one of the two parentsin the following four crosses? How many phenotypically different kinds of progeny could potentiallyresult from each of the four crosses?a. Aa Bb Cc Dd × aa bb cc ddb. aa bb cc dd × AA BB CC DDc. Aa Bb Cc Dd × Aa Bb Cc Ddd. aa bb cc dd × aa bb cc dd
Three genes in fruit flies affect a particular trait, andone dominant allele of each gene is necessary to get awild-type phenotype.a. What phenotypic ratios would you predict amongthe progeny if you crossed triply heterozygous flies?b. You cross a particular wild-type male in successionwith three tester strains. In the cross with one testerstrain (AA bb cc), only 1/4 of the progeny are wildtype. In the crosses involving the other two testerstrains (aa BB cc and aa bb CC), half of the progeny are wild type. What is the genotype of thewild-type male?
. A snapdragon plant that bred true for white petals wascrossed with a plant that bred true for purple petals, andall the F1 had white petals. The F1 was selfed. Among theF2, three phenotypes were observed in the followingnumbers:white 240solid purple 61spotted purple 19Total 320a. Propose an explanation for these results, showinggenotypes of all generations (make up and explain yoursymbols).b. A white F2 plant was crossed with a solid purple F2plant, and the progeny werewhite 50%solid purple 25%spotted purple 25%What were the genotypes of the F2 plants crossed?
In which type of cross(es) can we apply and demonstrate the law of segregation and law of independent assortment? Why can’t we apply the 2 Mendelian laws on monohybrid crosses? Explain briefly. How can one use a pedigree chart to hypothesize how a certain condition is transmitted? Can a pedigree chart show probability of occurrence more accurately than the Punnett square? Why or why not?
Two genes are located on the same chromosome and are known tobe 12 mu apart. An AABB individual was crossed to an aabb individualto produce AaBb offspring. The AaBb offspring were thentestcrossed to aabb individuals.If the testcross produces 1000 offspring, what are the predictednumbers of offspring with each of these four genotypes: AaBb,Aabb, aaBb, and aabb?
. In corn, the allele A allows the deposition ofanthocyanin (blue) pigment in the kernels(seeds), while aa plants have yellow kernels.At a second gene, W- produces smoothkernels, while ww kernels are wrinkled. Aplant with blue smooth kernels was crossedto a plant with yellow wrinkled kernels. Theprogeny consisted of 1447 blue smooth, 169blue wrinkled, 186 yellow smooth, and 1510yellow wrinkled.a. Are the a and w loci linked? If so, how farapart are they?b. What was the genotype of the blue smoothparent? Include the chromosomearrangement of alleles.c. If a plant grown from a blue wrinkled progenyseed is crossed to a plant grown from ayellow smooth F1 seed, what kinds of kernelswould be expected, and in what proportions?