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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.
LIVING FOSSILS - 1. Limulus (King crab) Arthropoda 2 . Neopelina Mollusca 3 .
The interactions between the human host and selected microorganisms that culminate in IE involve the vascular endothelium, hemostatic mechanisms, the host immune system, gross anat
Prophylaxis Medical Letter consultants generally do not prescribe antibiotic prophylaxis for travelers' diarrhea, but rather instruct thec patient to begin self-treatment when
Primary Succession - Community Change In primary succession on a terrestrial site the new site is first colonised by a few hardy pioneer species that are often microbes, liche
Define Body Composition Assessment Methods - Underwater Weighing? Underwater weighing or hydrostatic weighing is one of the most common body composition methods used in laborat
Why in the preparation of a karyotype analysis is the use of a substance like colchicine interesting? Colchicine is a substance that disallows the formation of microtubules and
CELL SURFACE JUNCTIONS (1 ) Desmosomes (Maculae adherence) - Thickened circular areas on P.M. of adjacent cells with radiating fibrils in cytoplasm. These fibrils calle
Define a liquid diet A liquid diet is the one which having of foods that can be served in liquid or strained forms at room temperature. These are usually prescribed after certa
examples of autotrophic nutrition
- Oogenesis involves the formation of haploid cells from an original diploid cell, called a primary oocyte, through meiosis. - The female ovaries contain the primary oocyte. The
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