The morphologic characteristics of chromosomes are best studied during metaphase and anaphase of cell division. The chromosome was supposed to be covered by a membranous Pellicle. Electron microscope studies later showed that there is no definite membranous pellicle surrounding the chromosomes. A matrix of some sort, possibly protein, lipid, may be present. Other structures present in the chromosome include the [...]
In this article we will discuss about the Mendel’s Principles. Also learn about its major limitations. Actually, the basic principles of heredity was formulated by Mendel in 1866 but under- standability and confirmation of Mendel's prinÂciples of heredity was clear to us after the rediscovery of Mendel's laws in 1900 by three geneticists : Correns, de Vries and Tschermark independently. [...]
In this article we will discuss about the features and effects of gene. Essential Features of Gene: Prior to 1940, recombination was not believed to occur within genes. The genes in a chromosome were considered analogous to beads on a string. Recombination was believed to occur only between the beads or genes. The gene was not considered subdivisible. But, on [...]