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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.
Q. Pulmonary Arterial System Changes ? a) Pulmonary Plethora With increased pulmonary arterial blood flow, pulmonary branches are visualized beyond the inner 2/3 of the lung
Explain the Cardiovascular disease and stroke? Obesity may be an independent risk factor for coronary heart disease (CHD) with the degree of obesity being directly proportional
Define Role of Fitness in Field of Human Endeavour? Fitness plays a vital role in any field of human endeavour and influences the efficiency of a person. For this reason, fitne
Find the initial osmotic pressure at room temperature for a cell if the only ions present are KCl and NaCl on either side of the membrane. Assume the concentrations for K+ and Na+
Q. What is the difference between sperm and spermatids cells? What is the name of the transformation of spermatids into sperm cells? Sperm cells (the male gametes) are matured
Events prior to the Sperm-Egg Fusion In a number of organisms that have been studied, the sperm remain immotile in the testis or in the semen. The sperm become active and mot
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Legume - Development of seeds Outer epidermis of the ovary usually forms the exocarp of the leguminous pod. Next few cell layers constitute the mesocarp with thick-walled pare
Explain Phenylephine and Methoxamine in amyl nitrite ? They have opposing effects to amyl nitrite as they increase the systemic BP. phenylephine due to its shorter duration of
Severe Acute Respiratory Syndrome (SARS) After travelers' diarrhea, respiratory infection is the most common infectious disease affecting travelers. In the winter of 2003 a ne
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