The below mentioned article provides a study note on transposable elements. The term “transposon” was coined by Hedges and Jacob in 1974 for mobile discrete DNA sequences in the genome; such sequences are able to transport themselves from one location to the other locations within the genome. These sequences are also called transposable genetic elements. […]
Study Notes on Transposable Elements | Chromosome
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Representing Chromosome Set of Species
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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 […]
Permanently Specialized Chromosomes
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The following points highlight the four main types of permanently specialized chromosomes. The types are: 1. Nucleolar Chromosomes 2. Sex Chromosomes 3. B Chromosomes 4. Chromosomes with Diffuse or Multiple Centromeric Regions. Permanently Specialized Chromosomes: Type # 1. Nucleolar Chromosomes: The chromosome forming the nucleolus (plural = nucleoli) is called the nucleolar chromosome. Normally one […]
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