Structures of chromosomes(drosophila salivary gland)

1. Subject

Drosophila salivary gland chromosomes, commonly known for their polytene structures, represent an extraordinary example of chromosome organization and functionality. Polytene chromosomes are formed through multiple rounds of DNA replication without the accompanying cell divisions, resulting in large, distinctive chromosomes that are easily observable under a light microscope. These chromosomes display a characteristic banding pattern that is crucial for genetic studies and molecular biology. In Drosophila, the salivary glands undergo extensive growth during larval development, leading to the formation of these polytene chromosomes. Each chromosome consists of identical sister chromatids that are physically aligned side by side, thus forming a visible structure that can contain hundreds of thousands of DNA molecules stacked together. The polytene chromosomes of Drosophila are particularly convenient for genetic research due to their large size, which allows researchers t
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