Analysis of genomic equivalence of nuclei, Biology

Analysis of Genomic Equivalence of Nuclei

Towards the ending of 19th century August Weismann had proposed that during cleavage the genetic determinants (later shown to be chromosomes) were parceled out between different blastomeres in some manner that determined the path of differentiation that a given cell might take. As per to this theory only the germ cells contained all the genetic determinants and the several somatic cell types differed in the genetic determinants that they contained. In other words, the nuclei of only the germ cells consist of all the genes and have a complete genome, whereas the nuclei of dissimilar somatic cells may contain only those genes that are needed for their specific type of differentiation.

However, on the basis of many studies it is believed that in an organism nuclei of all cells of the body consist of a complete and identical set of all the genes as that in the original nucleus of the zygote. It means that the genomes of all cells and the zygote are equal. Development involves utilization of different genes from this common genome through each cell type for its own particular type, of differentiation. This belief in genomic equivalence of nuclei of all cells is supported through a fair amount of evidence of both genetic and embryological nature. It has been found that particular number of chromosomes, on which genes are arranged, is constant throughout all the dissimilar tissues of the adult organism. The DNA, the carrier of genetic information, extracted from different somatic tissues has identical composition and properties. It has been shown that in the larvae of Chironomus and as well Drosophila the number of chromosomes and their banding pattern (pointing out the number of genes) are constant in all cells.

Posted Date: 1/29/2013 12:12:28 AM | Location : United States

Related Discussions:- Analysis of genomic equivalence of nuclei, Assignment Help, Ask Question on Analysis of genomic equivalence of nuclei, Get Answer, Expert's Help, Analysis of genomic equivalence of nuclei Discussions

Write discussion on Analysis of genomic equivalence of nuclei
Your posts are moderated
Related Questions
ADP is lower energy form of ATP, containing two (in spite of the three in ATP) phosphate groups attached to the adenine base and ribose sugar.

CHEMICA L COMPOSITION OF CHROMATIN Chromatin threads composed of DNA (31 %), RNA (2-5%) and proteins (Histon-36%, Non histon 28%). Histone and protamines are basic prote

Candidiasis Candidiasis (Moniliasis) is a disease of man, animals and birds and is caused chiefly by Candida albicans. Crop mycosis (thrush) of poultry is caused by C. albicans

Adverse effects of Efavirenz The most common adverse effects have been rash, dizziness, headache, insomnia and inability to concentrate. Vivid dreams, nightmares and hallucinat

Oceanic islands are interesting and somewhat specialised biomes. Islands which have broken away from the main continents have similarity of flora and fauna related to the continent

What is the function of a control group in an experiment? The function of a control group in an experiment is to be a stable to account for any effects a given environment has

How does the inflammation mechanism work? When some tissue injury happens histamine and other vasoactive substances (known as mediators of inflammation) are released, they caus

Define nutrient requirements and principles of meal planning? In this , we started our discussion with the school age and its characteristics. We learnt about the physical grow

Nursing Care of Common Cold: Relieve Nasal Congestion Clean the nasal passage to remove secretions. In  infants nasal aspirator can be used while  the older children can

Q. What are the classes into which the phylum Echinodermata is divided? The five echinoderm classes are: asteroids (starfishes), ophiuroids, crinoids, holothuroids (sea cucumbe