Question:
The point, at which polytene chromosome appear to be attached together, is called
The point, at which polytene chromosome appear to be attached together, is called
Updated On: Aug 3, 2024
- centromere
- chromomere
- chromocentre
- centriole.
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The Correct Option is C
Solution and Explanation
Chromocentre is junction point of the chromosomes in the polytene salivary glands of Drosophila larvae. Unlike the situation in other cells, the giant chromosomes of these cells persist through interphase, the two homologous copies of each chromosome are attached together through out their lengths and all the chromosomes are joined together by a chromocentre.
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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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