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Summary Everything about Meisos and Mitosis Grade 10-12
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,Contents• What is Meiosis cell division
• History of meiosis
• Where it occurs?
• Phases of meiosis-I
• Crossing over & importance
• Phases of meiosis-II
• Importance of meiosis
, What is meiosis cell division?
• Meiosis is a special type of cell division
necessary for Sexual Reproduction.
• Meiosis begins with one diploid cell co
ntaining two copies of each chromoso
me.
• One from the organism’s mother and o
ne from it’s father.
• Produces for haploid cells containing o
ne copy of each chromosome.
, History of meiosis
• Meiosis was discovered and described for the fir
st time in Sea Urchin eggs in 1876 by the Germa
n biologist Oscar Hertwig.
• It was described again in 1883, at the level of ch
romosomes, by the Belgian zoologist Edouard V
an Beneden in Ascaris worm’s eggs.
• The term “Meiosis” was coined by J.B. Farmer a
nd J.B. Moore in 1905.
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