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 [...]
In this article we will discuss about the meaning and classification of euploidy. Meaning of Euploidy: Most diploid sexually reproducing organisms have an alternation between a haploid and a diploid state in the life cycle. The haploid state, mostly confined to germ cells, is characterised by the presence of a single set of chromosomes (n). When two haploid germ cells [...]
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% [...]