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Explain Crossing Over in genetics?
Crossing over is when the arms of homologous chromosomes exchange segments (and therefore genes) with each other. Recall that one of the homologues originally came from the father's sperm and the other came from the mother's egg.
During Prophase I of Meiosis the homologous chromosomes pair up to form a tetrad. The arms of the chromatids overlap, and can sometimes swap portions. This exchange results in a genetic recombination of the parental genes, providing for genetic variation, the raw material for evolution.
classification of excretory organs in helminthes, nermatodes, annelids, molluscs, arthropods and echinodems
why can only one kind of cellulose be formed?
Menerals are naturally occurring inorganic solids with a crystalline structure and a definite range of chemical formula. Ores are concentrations of minerals in rock.
We now understand that mutations that cause the inhibition of apoptosis are found in tumors. Because proliferation itself is not induced by the inhibition of apoptosis, explain how
Determine the Uni-ocular movements Uni-ocular movements are the movements of one eye studied at a time. That means, when left eye is covered, then movements of uncovere
Explain the importance of parent material Part of these weathered minerals are transported away by volcanoes, wind, water, ice, and waves etc. These very factors transport th
how conjugation takes place in paramecium
How are grasslands classified? Grasslands might be classified into steppes and savannahs. In the steppes the prevailing vegetation is grass, as in the pampas of South America
Primitive Arthropods The primitive arthropods, Onychophora (for example Peripatus) have a series of paired legs which are not jointed but have a ringed appearance because of t
Q. Write the meaning of Hypoglycemia? Hypoglycemia is a Greek term: hypo -meaning less; glyc - means sweet; and emia - means "of the blood". It is a condition in which less th
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