{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Why Divide - This type of cell division allows...

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Why Divide? Single-celled organisms divide to reproduce. Cell division in multicellular organisms enables the organism to grow larger while the cells remain small. A large surface:volume ratio is due to small cell size. Organisms with many cells can have cells which are specialized for different functions and tasks. For example, red blood cells are specialized for carrying oxygen but neurons (nervous tissue) are specialized for conducting signals from one cell to another. Some cells of multicellular organisms must divide to produce sex cells (gametes). Mitosis Mitosis produces two daughter cells that are identical to the parent cell. If the parent cell is haploid (N), then the daughter cells will be haploid. If the parent cell is diploid, the daughter cells will also be diploid. N N 2N 2N
Image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: This type of cell division allows multicellular organisms to grow and repair damaged tissue. Meiosis Meiosis produces daughter cells that have one half the number of chromosomes as the parent cell. 2N → N Meiosis enables organisms to reproduce sexually . Gametes (sperm and eggs) are haploid. Meiosis is necessary in sexually-reproducing organisms because the fusion of two gametes (fertilization) doubles the number of chromosomes. Meiosis involves two divisions producing a total of four daughter cells. Click here to go to the chapter on meiosis. Chromosome Structure and Replication A chromatid is a single DNA molecule. Double-stranded chromosomes have two chromatids; normally, each one is identical to the other. The point where the two chromatids are attached is called the centromere ....
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern