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Why is meiosis important for the maintenance of the normal quantity of chromosomes of a species with sexual reproduction?
A reduction to a half of the maximum normal quantity of chromosomes is mandatory in some phase of the life cycle of a species that reproduces sexually. If that could not occur in every generation, whenever a zygote is created by fusion of gametes there would be duplication in the quantity of chromosomes in a geometric progression.
STRUCTUR E OF PROTEINS Proteins which are mixed polymers of amino acids can have up to four structural levels - Primary, Secondary, Tertiary, Quaternary 1 . PRIMA
what is plasmalemma?
How to Care of the Ventilated Patient Constant focused attention is required for the patient on mechanical ventilatory support. A good understanding of the problems that can a
What are Goitrogens? Certain chemical substances like thiocyanates, phenols, disuphides, flavanoids etc, found in the environment, can interfere with iodine metabolism. These s
What is Cyanosis ? Cyanosis: Cyanosis may be peripheral or central. Peripheral cyanosis almost exclusively involves lips and extremities. Normal neonates may have bluish extrem
Industrial melanism refers to the dark pigmentation that evolved in some insects giving them protective coloration on vegetation darkened by soot in heavily industrialized areas pr
Properties of pyridoxine a) It forms white, odourless crystals. b) The compound is readily soluble in water. c) When a neutral or alkaline solution of pyridoxine is
what Photoperiodism
A DNA library is a collection of cloned DNA fragments in a cloning vector which can be fined for a DNA of interest. If the target is to isolate particular gene sequences.
Emphysema Emphysema is destructive changes in alveolar walls and enlargement of air spaces distal to the terminal non-respiratory bronchioles. It is characterized physiolog
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