MEANING OF MEIOSIS

MEANING OF MEIOSIS

meiosis (reduction division) n. a type of cell division that produces four daughter cells, each having half the number of chromosomes of the original cell. It occurs before the formation of sperm and ova and the normal (*diploid) number of chromosomes is restored after fertilization. Meiosis also produces genetic variation in the daughter cells, brought about by the process of *crossing over. Meiosis consists of two successive divisions, each divided into four stages (see PROPHASE, METAPHASE, ANAPHASE, TELOPHASE). (See illustration.) Compare MITOSIS. —meiotic adj.

Prophase I leptotene

 

chromosome      centriole

cell membrane    nucleer membrane

zygotene  to pachytene

bivalent of homologous chromosomes 

 

 

 

 

 

 

of each pair goes to each pole

 

 

 

 

 

 

 

Metaphase II to Anaphaee II

 

 

 

Telophesa II

four h8ploid nuclei

KNOWLEDGE BASE
About Genomic Medicine UK

Genomic Medicine UK is the home of comprehensive genomic testing in London. Our consultant medical doctors work tirelessly to provide the highest standards of medical laboratory testing for personalised medical treatments, genomic risk assessments for common diseases and genomic risk assessment for cancers at an affordable cost for everybody. We use state-of-the-art modern technologies of next-generation sequencing and DNA chip microarray to provide all of our patients and partner doctors with a reliable, evidence-based, thorough and valuable medical service.

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