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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.
RESPIR A T ORY ORGANS IN ANIMALS - In Protozoa plasmalemma functions as respiratory surface. In Porifera, respiration occur through body wall. In Coelentrata resp
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