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THEORIES TO EXPLAIN FINE STRUCTURE OF CHROMOSOME
(1) Multistranded theory
Steffenson 1959 - each chromosome composed of two chromatids (Half Chromosome) and each chromatid composed of 16 DNA molecules.
(2) Folded fibril theory
Du Praw 1965 - Chromosome consist of single DNA variously folded to form two Chromatids.
(3) Unineme theory
Hans Ris (1967) - Each Chromosome consists of two chromatids and each chromatid have one DNA molecule.
This theory is most acceptable as it is supported by meiosis and crossing over studies.
There has been a perfect coevolution between plants and herbivorous animals. This has often developed into a mutually beneficial relationship. Whereas the plants have proved to be
What chemical is normally used to test for the presence of carbon dioxide? What is the result of the test if carbon dioxide is present? a) Lime water is used t
Diagnosis of galactosemia is by measuring the activity of gal-l-P-transferuse in erythrocytes. Galactose should be restricted if the gal-1 -P-transferase is elevated above 2 mg/dl.
Q. Merits and Demerits of system classification? Merits The merits of this system\are as under: • Careful observation and original description of the genera from living
What are the advantages of ecological pyramids?
Your client has the flu and reports 5-6 loose stools a day. He has experienced an isotonic fluid volume loss. Explain what an isotonic fluid loss means.
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what is the excretory organs of,rat,fish,lizard,frog,cockroach,bird and snail.
Viral vectors There are a large number of viral vectors available which can transfer the desired sequence properly into the host. Examples of the viral vectors are as follows
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