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Question
Accurate mapping of genes can be done by three-point test cross because increases
Options
Possibility of single cross over
Possibility of double cross over
Possibility of multiple cross over
Possibility of recombination frequency
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Solution
Possibility of double cross over
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If you cross dominant genotype PV/PV male Drosophila with double recessive female and obtain F1 hybrid. Now you cross F1 male with double recessive female.
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| S. no | Gamete types | Number of progenies |
| 1. | ABC | 349 |
| 2. | Abc | 114 |
| 3. | abC | 124 |
| 4. | AbC | 5 |
| 5. | aBc | 4 |
| 6. | aBC | 116 |
| 7. | ABc | 128 |
| 8. | abc | 360 |
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- How will you construct gene mapping from the above-given data?
- Find out the correct order of genes.
What is gene mapping? Write its uses.
Write the steps involved in the molecular mechanism of DNA recombination with a diagram.
