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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. Why are vaccines used in the prevention but not in the treatment of infections? Why can antivenom serums be used in prevention and treatment? Vaccines are not used in the tr
Explain the Characteristics of Agar- Agar? There are many characteristics, which make agar-agar, an ideal solidifying agent. These are: (a) It has high gel strength, so it c
Chemical energy of matter : As is obvious from the above account living cells obtain energy by breaking C-C and C-H bonds of organic matter under the process of catabol
Cyanobacteria carry out photosynthesis using two photosystems as in green plants. Furthermore, other photosynthetic bacteria, like as the purple photosynthetic bacterium Rhodospiri
What is Barfoed's test and its principle? This test is a specific test for monosaccharides. Principle This test is also a copper reduction test but differs from Fehling
Comparison of CABG and Angioplasty : Results of six major randomized clinical trials of multi vessel angioplasty Vs CABG are now available. The main conclusions are: Patient
locomotion in amoeba
Catecholamines increase activation of Ca 2+ via beta-adrenergic receptors and the adenyl cyclase system. Dopamine has both alpha and beta and dopaminergic effects. Its beta ef
You have an extensive library of genomic DNA fragments, prepared by the use of restriction nucleases. You know their sequences and sizes and you have an assay to reliably separate
Of which type of defense cell do viral infections stimulate the multiplication? The major leukocytes that generally multiply and participate in the defense against viral infect
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