Question:
The polytene chromosomes were discovered for j the first time in
The polytene chromosomes were discovered for j the first time in
Updated On: Aug 3, 2024
- Drosophila
- Musca domestica
- Chironomus
- Musca nebula.
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The Correct Option is C
Solution and Explanation
In salivary glands cells of Chironomus tantans giant chromosomes were observed by E.G Balbini for the first time in 1881. The availability of these chromosomes greatly helped in the study of Drosophila cytogenetics in which they where discovered later.
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Concepts Used:
Chromosomal Theory of Inheritance
Chromosomal theory: Linkage and Genetic Recombination
If two genes were present on the same chromosome, the chances of getting a parental combination were much higher in the next generation in comparison to the non-parental combination. This physical association of genes was termed ‘linkage’. The description of the non-parental gene combinations in a dihybrid cross is termed ‘genetic recombination'. After the discovery of linked genes, the frequency of linked genes also influenced the appearance of traits in the next generation.
Observations of Chromosomal Theory of Inheritance:
- During the cell division-meiosis process, the pairs of homologous chromosomes move as discrete structures, which are independent of other pairs of chromosomes.
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- The gametic chromosomes fuse during the process of fertilization to produce offspring with the same number of a chromosome as their parents.
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