A 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 F, progeny to anomalous, buckled, curved flies. She obtains 1000 progeny distributed as shown. From this data, calculate the map distance between b and c. Testcross progeny phenotype Number curved 277 map distance: m. u. anomalous, buckled 283 wild type 4 anamalous, buckled, curved buckled, curved 128 anomalous 132 anomalous, curved 83 buckled 87

Human Anatomy & Physiology (11th Edition)
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Chapter1: The Human Body: An Orientation
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A 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*.

| Testcross progeny phenotype    | Number |
|-------------------------------|--------|
| curved                        | 277    |
| anomalous, buckled            | 283    |
| wild type                     | 4      |
| anomalous, buckled, curved    | 6      |
| buckled, curved               | 128    |
| anomalous                     | 132    |
| anomalous, curved             | 83     |
| buckled                       | 87     |

**Map distance:** \_\_\_\_\_\_\_\_ m.u.
Transcribed Image Text:A 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*. | Testcross progeny phenotype | Number | |-------------------------------|--------| | curved | 277 | | anomalous, buckled | 283 | | wild type | 4 | | anomalous, buckled, curved | 6 | | buckled, curved | 128 | | anomalous | 132 | | anomalous, curved | 83 | | buckled | 87 | **Map distance:** \_\_\_\_\_\_\_\_ m.u.
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