In this article we will discuss about the classification of human chromosomes on the basis of size and position of the centromere. All the human chromosomes in normal numbers (46) can be arranged in groups based on size and positions of the centromere. The resulting classification of the chromosomes is given in the following table: Methods of Human Chromosome Classification [...]
In this article we will discuss about the chromosome theory of inheritance. In order to understand the role played by chromosomes as carriers of hereditary material, we must turn the clock backward to some landmarks in the history of genetics. The earliest records date back to the work of the 18th Century plant hybridisers. One of them Kolreuter had some [...]
The following point highlight the five main types of structural variation in chromosomes. The types are: 1. Deletion or Deficiency 2. Duplications 3. Translocations 4. Inversions 5. B-Chromosomes. Type # 1. Deletion or Deficiency: A deficiency means deletion of a small portion of a chromosome resulting in loss of one or more genes. A deficiency originates from breakage occurring at [...]