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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.
Extremes of Heat and Cold Deserts are regions of aridity with rainfall of less than 20 cm per year and the soil, though L, fertile, is too porous to retain any water. In summer
What is panspermia? The Panspermia is a hypothesis that describes life on earth as not originated from the planet. The thought is that the first living beings that colonized th
MASTITIS The term mastitis refers to the inflammation of udder and is characterized by physical and chemical changes in the milk which include discolouration, presence of clots
Exercise Stress or emotional upset Medications Aspirin, non-steroidal anti-inflammatory drugs(NSAIDs), beta- blockers(including eye drops), cholinergic dr
Following are the functions of Insulin: 1) Insulin controls the level of the sugar (glucose) in the blood. 2) Insulin permits cells to use sugar (glucose) for energy. Cells c
Please I need short notes on polyphylrtic theory
composition of aquatic animals what are their groupings
Ranikhet disease Ranikhet disease, also known in the west as Newcastle disease, is a contagious and highly fatal disease of fowls caused by a virus of the genus Rubulavirus in
a sea urchin egg is injected with an mRNA encoding the cadherin protein fragment described above and an mRNA encoding the Pmar1 transcription factor. The embryo is allowed to devel
What are the causes of endodontic pain? Lesions in retreatment cases called post endodontic diseases. Reasons of Endo retreatment; = reasons of failure: - Signs or symptoms of
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