Practice: The following table shows data from a cross (ABC x abc) examining three genes (a, b, and c). Calculate the recombination frequency for A and B
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| Trihybrid Cross | 37 mins | 0 completed | Learn |
| Multiple Cross Overs and Interference | 9 mins | 0 completed | Learn |
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Practice: The following table shows data from a cross examining three genes (a, b, and c). Calculate the recombination frequency for A and C
Practice: The following table shows data from a cross examining three genes (a, b, and c). Calculate the recombination frequency for B and C
Practice: The following table shows data from a cross examining three genes (a, b, and c). Determine the order of genes
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Additional Problems
In the fruit fly, Drosophila melanogaster, a spineless (sp, no wing bristles) female fly is mated to a male that is claret (cl, dark eyes) and hairless (h, no thoracic bristles). Phenotypically wild-type F1 female progeny were mated to fully homozygous (mutant) males and the following progeny (1000 total) were observed. PhenotypesNumber Observedspineless321wild38claret, spineless130claret18claret, hairless309hairless, claret, spineless32hairless140hairless, spineless12What is the correct gene map for these genes?
Assume that a female fly that has disrupted wings (dsr) and a speck body (sp) is mated to a male that has cinnabar eyes (cn).Phenotypically wild-type F1 female progeny were mated to males that had speck bodies, disrupted wings and cinnabar eyes, and the following progeny were observed.PhenotypeNumber of offspringwild-type112disrupted wings52speck body22cinnabar eyes235disrupted wings, speck body241disrupted wings, cinnabar eyes25speck body, cinnabar eyes46disrupted wings, speck body, cinnabar eyes117Part A. From this information, determine which gene is in the middle.a) dsrb) cnc) spPart B. With respect to the three genes mentioned in the problem, what are the genotypes of the parents used in making the phenotypically wild-type F1 heterozygote?a) sp dsr cn / sp dsr cn and sp+ dsr+ cn+ / sp+ dsr+ cn+b) sp dsr cn+ / sp dsr cn+ and sp+ dsr+ cn+ / sp+ dsr+ cn+c) sp dsr+ cn / sp dsr+ cn and sp+ dsr+ cn / sp+ dsr+ cnd) sp dsr cn+ / sp dsr cn+ and sp+ dsr+ cn / sp+ dsr+ cnPart C. What is the map distance between sp and dsr? Express your answer to the nearest whole number.Part D. What is the map distance between dsr and cn? Express your answer to the nearest whole number.
Suppose a geneticist uses a three-point testcross to map three recessive, linked hummingbird wing-shape mutations called tk, f, and b, where tk is associated with thick wings; f is associated with flat wings; and b is associated with blunt wings. He first crosses homozygous blunt birds to homozygous thick, flat birds. Next, he backcrosses the F1 progeny to thick, flat, blunt birds. He obtained the following results.Given this data, label the progeny phenotypic classes as either parental, single crossover (SCO), or double crossover (DCO) recombinant types. Each label may be used multiple times. Two classes have already been filled in for you.
A geneticist is using a three-point test cross to map three linked Drosophila recessive mutations called a, b, and c, where a is associated with anomalous gait; b is associated with buckled wings; and c is associated with curved bristles. She first crosses homozygous anomalous, buckled flies to homozygous curved flies. Next, she test crosses the F1 progeny to anomalous, buckled, curved flies. She obtains 1000 progeny distributed as the following results. From this data, calculate the map distance between a and c.