CellBio6 - Gametogenesis Fertilization and the Principles...

Info icon This preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Gametogenesis, Fertilization, and the Principles of Early Development Meiosis Occurs During Formation of Eggs and Sperm In most eukaryotic organisms, all cells in the body except for the egg and sperm cells, are diploid (2 n) Mature eggs and sperm are haploid (1 n) Eggs and sperm are produced in the gonads (ovaries, testes) by the process of meiosis Diploid precursor cells develop into haploid gametes (egg cells and sperm cells)
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
2 Spermatogenesis; the Development of Sperm Cells A spermatogonium divides by mitosis to form another spermatogonium and a primary spermatocyte (2 n) The primary spermatocyte divides by meiosis I to produce 2 secondary spermatocytes The two secondary spermatocytes divide by meiosis II to produce 4 spermatids The 4 spermatids differentiate into 4 mature sperm cells (spermatozoa) 2n !!
Image of page 2
3 1 n) !!! Formation of Spermatazoa (Sperm Cells)
Image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
4 A Sperm Cell has 3 Main Parts 1) The head contains the DNA and a secretory vesicle, called the acrosomal vesicle The neck, or midpiece, contains a mitochondrion which supplies ATP The tail contains the 9+2 arrangement of microtubules and the motor molecule dynein- powers a whip-like bending Oogenesis, Formation of Eggs The large starting diploid cell, the oogonium (2 n), divides by mitosis to form two primary oocytes
Image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the 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