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Mitosis and Meiosis: How do Cells Divide?

Mitosis and Meiosis: How do Cells Divide?

(source: ghr.nlm.nih.gov)

National Library of Medicine

There are two types of cell division: mitosis and meiosis. Most of the time when people refer to “cell division,” they mean mitosis, the process of making new body cells. Meiosis is the type of cell division that creates egg and sperm cells.

Mitosis is a fundamental process for life. During mitosis, a cell duplicates all of its contents, including its chromosomes, and splits to form two identical daughter cells. Because this process is so critical, the steps of mitosis are carefully controlled by a number of genes. When mitosis is not regulated correctly, health problems such as cancer can result.

The other type of cell division, meiosis, ensures that humans have the same number of chromosomes in each generation. It is a two-step process that reduces the chromosome number by half – from 46 to 23 – to form sperm and egg cells. When the sperm and egg cells unite at conception, each contributes 23 chromosomes so the resulting embryo will have the usual 46. Meiosis also allows genetic variation through a process of DNA shuffling while the cells are dividing.


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    silver_rose

    about 3 years ago

    4 comments

    why every stage of the mitosis & meiosis are important in cell divison ?? : can someone answer ?? - my_sweetestboy@yahoo.com

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    Account Removed

    over 5 years ago

    Oh my gosh this is my mid-semester test, well part of it. Can anyone get a copy?

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    sanjita

    over 5 years ago

    6 comments

    Thanks, its helpful tip to remind me.

  • Dad__mom_and_josh_005_max50

    lpnstudent09

    over 5 years ago

    4 comments

    thanks i had forgotten how that worked it helped alot

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    aywashe

    over 5 years ago

    4 comments

    THANK YOU

  • Photo_user_blank_big

    aywashe

    over 5 years ago

    4 comments

    Thank you continue ......

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