Upload NowIn this article we will discuss about the chromosome theory of heredity with the help of suitable diagram. By the year 1900, due to improvements in cytological techniques and in the optical properties of microscopes, the behaviour of chromosomes in the cells was studied. William Sutton noticed striking similarities in the behaviour of chromosomes during […]
Chromosome Theory of Heredity (With Diagram) | Genetics | Biotechnology
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Structure of Chromosomes: Prokaryotic & Eukaryotic | Genetics | Biotechnology
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The word ‘chromosome’ was coined by Waldeyer and means coloured body. Chromosomes are found in viruses, prokaryotes and eukaryotes. 1. Prokaryotic Chromosome: Prokaryotic cells do not possess nuclear membrane and the genetic material is found in a compact structure called nucleoid. A prokaryotic cell possesses a single chromosome which is irregularly folded into a compact […]
Deviations from Mendelian Ratio (With Diagram) | Genetics | Biotechnology
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A number of deviations were identified in the post-Mendelian era. The normal monohybrid ratio of 3:1 will occur only when the allele have a relationship of dominance and recesiveness between each other. In the absence of such a relationship, the 3:1 becomes modified variously. Let us understand this with the following examples: 1. Incomplete or […]