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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.
USES OF DRUGS - 1. Drugs are prescribed as medicines to prevent or cure a variety of diseases. 2. May be used to promot physical and mental health. 3. U
the concept that new varieties of organisms are still evolving is best supported by the.......?
Explain the term- PUPIL Pupil is the aperture in centre of the iris diaphragm that regulates entry of light into the eye. Colour of pupil is said to be black. Actu
Q What are the few examples of annelids? Earthworms, lugworms and leeches. Q. Which are the morphological features that differentiate the beings of the phylum Annelida from
Describe TS Murmur and their characterstic ? Characteristic: It is a rumbling, and diastolic murmur heard at left lower sterna border that increases with inspiration. An OS may
Simple Febrile Convulsions These are convulsions associated with fever and infection, and is commonest causes of seizures during infancy and early childhood. These convulsio
What are the typical vegetation and the typical fauna of the deserts? The predominant fauna of the desert ecosystems is formed by reptiles, like snakes and lizards, terrestrial
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How do the products of meiosis I differ from those of meiosis II? In meiosis I, the offspring cells are haploid but every cell contains two copies of the chromosome because th
Explain the Quebec Colony Counter? It is used for counting the number of colonies in a plate. Culture plate is kept on the screen which is illuminated from beneath. Counting is
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