स्पेशल टाइप्स ऑफ क्रोमोसोम
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"In Eukaryotic organisms certain chromosomes are found only in certain special tissues and are not seen in other tissues. These chromosomes are larger in size and are called giant chromosomes. In certain plants, they are found in the suspensors of the embryo. There are two types of giant chromosomes - polytene chromosome and lamp brush chromosome.Polytene chromosomes were observed by C.G. Balbiani in 1881 in the salivary glands of Drosophila. The characteristic feature of polytene
Polytene chromosomes were observed by C.G. Balbiani in 1881 in the salivary glands of Drosophila. The characteristic feature of polytenechromosome is that along the length of the chromosome there is a series of dark bands alternate with clear zones called inter bands. The polytene chromosome has extremely large puff called Balbiani ring. It is also known as chromosomal puff. As this chromosome occurs in the salivary gland it is known as salivary gland chromosomes."