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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.
What is the Nonhuman Experimental Studies How normal brain development proceeds is essential knowledge for professionals concerned with understanding infant and young child dev
are protozoans primitive to life .
What is Cerebrum Cerebrum is divided into right and left parts known as cerebral hemisphere. It is the largest part of the brain. The functions of the cerebrum: It recei
Q. What are the periods of the first meiotic division? Meiosis I is divided into metaphase I, prophase I, anaphase I and telophase I.
Agriculture, industry, and growing populations of cities all compete, through political influence, for water. If you were in charge of water resources in an arid region, what would
Stratification of Vegetation - Qualitative Characters Stratification of vegetation is another important feature of plant communities. There are different vertical strata in di
Auxins - Plant Growth Substances Julius Sachs (1882) first suggested on the basis of his observations that there are special substances for forming roots and some special subs
What are steroids? What are some examples of steroids with a biological function? Steroids are lipids based in an angular combination of four carbon rings, three of them made o
Phosphodiesterase Inhibitors and Other Agents Amrinone and Milrinone are prototypes of type III PDE inhibitors. They decrease the breakdown of cyclic AMP in the myocardium and i
How do populations of predators and prey vary in predatism? Whenever a predator population enhances at the first moment the prey population tends to decrease. At a second momen
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