In this article we will discuss about the aneuploidy in drosophila and humans. Aneuploidy in Drosophila: The strain of attached X-females further explains the consequences of aneuploidy. Besides sex chromosomes, autosomes in Drosophila can also have nondisjunction. The tiny dot-like chromosome 4 if present in the trisomic state produces viable but phenotypically deformed offspring. But if one of the very [...]
The below mentioned article provides notes on colchicine. In 1937 O.G. Eigsti first succeeded in inducing tetraploidy in cells of onion root tips by the chemical colchicine. This is an alkaloid obtained from the seed and corm of liliaceous plant Colchicum autumnale. In high concentrations the drug is highly toxic to cells. If used in concentrations as low as 0.01% [...]
Some investigators of 1950s focused their attention on viruses containing protein and RNA, but no DNA. The poliomyelitis virus, influenza virus and the virus that causes mosaic disease in tobacco plants (TMV) were thus shown to have genes made of RNA. Earlier in 1935 W. M. Stanley had reported the isolation of a crystalline protein from infected tobacco plants, which [...]