Tag Archives | Eukaryotic

Structure of Nucleosome | Genetics

In this article we will discuss about the structure of nucleosome. When chromatin or whole chromosomes are spread on an air-water interface and examined in the electron microscope, fibers 250 Å in diameter are observed. These are de-oxy-nucleoprotein fibres in which DNA is complexed with protein. Removal of proteins by various methods reveals the 10 nm fibre (1nm = 10 [...]

By |2016-12-12T07:24:35+00:00December 12, 2016|Genetics|Comments Off on Structure of Nucleosome | Genetics

Heterochromatin and Euchromatin

In this article we will discuss about the heterochromatin and euchromatin in eukaryotic chromosomes. The terms "heterochromatin" and "euchromatin" were given by Heitz in 1928-29, although they had been discovered much earlier. Heterochromatic blocks observed during interphase were earlier termed as pro-chromosomes. The substance of which eukaryotic chromosomes are composed is known as chromatin; it contains DNA, protein and a [...]

By |2016-07-12T13:51:02+00:00July 12, 2016|Eukaryotic Chromosomes|Comments Off on Heterochromatin and Euchromatin

Representing Chromosome Set of Species

The following points highlight the two main ways of representing chromosome set of species. The ways are: 1. Karyogram 2. Idiogram or Idiotype. Representing Chromosome: Way # 1. Karyogram: Photomicrographs of the chromosomes of a single representative somatic metaphase cell are clipped out and arranged in homologous pairs according to their size. If the chromosomes are small and there is [...]

By |2016-07-12T13:51:01+00:00July 12, 2016|Eukaryotic Chromosomes|Comments Off on Representing Chromosome Set of Species
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