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प्रश्न
What is gene mapping? Write its uses.
उत्तर
The diagrammatic representation of the position of genes and related distances between the adjacent genes is called genetic mapping. It is directly proportional to the frequency of recombination between them. It is also called a linkage map.
Uses of genetic mapping:
- It is used to determine gene order, identify the locus of a gene and calculate the distances between genes.
- They are useful in predicting the results of dihybrid and trihybrid crosses.
- It allows the geneticists to understand the overall genetic complexity of the particular organism.
संबंधित प्रश्न
Accurate mapping of genes can be done by three-point test cross because increases
Which one of the following hydrolysis internal phosphodiester bonds in a polynucleotide chain?
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.
How is Nicotiana exhibit self-incompatibility? Explain its mechanism.
When two different genes came from the same parent they tend to remain together.
Draw the cross with a suitable example.
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.
Write the steps involved in the molecular mechanism of DNA recombination with a diagram.
