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Question
When two different genes came from the same parent they tend to remain together.
Draw the cross with a suitable example.
Solution
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Accurate mapping of genes can be done by three-point test cross because increases
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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.
What type of linkage is seen?
Explain the mechanism of crossing 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.
Draw the cross with the correct genotype.
| 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 |
- What is the name of this test cross?
- 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.
