Meiosis

Meiosis

• The gametes of human beings are the sperm and ovum .
• The gametes are said to be haploid.（n,where n=23）.
• During meiosis,the number of chromosomes are reduced haif .
• Hence , meiosis    is also know as reduction division
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• Meiosis halves the chromosome number during the formation of gametes , so that the gametes formed are upon fertilisation .
• As a result of crossing over during prophase 1 and independent assortment of chromosomes during metaphase 1, the gametes formed are all genetically different . This gives rise to variation among offspring . Variation is important in ensuring the continued existence of  a species under changing environmental conditions 
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