geneticist is using a three‑point testcross 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 testcrosses the F1 progeny to anomalous, buckled, curved flies. She obtains 1000 progeny distributed as shown. From this data, calculate the map distance between b and c.   progeny curved    277 anomalous, buckled  283 wild type     5 anamalous, buckled, curved     5 buckled, curved      133 anomalous        127 anomalous, curved     86

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Chapter20: Chromosomes And Human Genetics
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Problem 7CT: The following pedigree shows the pattern of inheritance of red-green color blindness in a family....
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A geneticist is using a three‑point testcross to map three linked Drosophila recessive mutations called ab, 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 testcrosses the F1 progeny to anomalous, buckled, curved flies. She obtains 1000 progeny distributed as shown. From this data, calculate the map distance between b and c

 progeny

curved    277

anomalous, buckled  283

wild type     5

anamalous, buckled, curved     5

buckled, curved      133

anomalous        127

anomalous, curved     86

buckled       84

 

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