Overview of meiosis illustration
Overview of meiosis illustrationOverview of meiosis illustrationOverview of meiosis illustration
Overview of meiosis illustration
ANAT & PHYSGENERAL BIOCELL BIOMICRO 8wkMICRO 15wkINSTRUCTORS


Types of Cell Division: Meiosis - P3
Diagram of Mitosis
SPO VIRTUAL CLASSROOMS
Sources and Helpful Links on Cell Division
  • Campbell, N. A. & Reece J. B. (2005) Biology, seventh edition. Pearson Education Inc.
  • Campbell, N. A., Reece J. B. & Simon, E. (2004) Essential Biology with Physiology. Pearson Education Inc.​

Meiosis Diagram
PAGE 3                                                          <  Back to Page 2
End of Article
Learn about Binary Fission 
<  Back to Page 1

Virtual Cell Biology
Classroom






You have free access to a large collection of materials used in a college-level introductory Cell Biology Course. The Virtual Cell Biology Classroom provides a wide range of free educational resources including Power Point Lectures, Study Guides, Review Questions and Practice Test Questions.
Endomembrane System of a Eukaryotic Cell, Mariana Ruiz
See our FREE
Photo Guides to    
Mitosis & 
Meiosis 
Classroom  
Activities
Mitosis Classroom Exercise
BACK TO Types of Cell Division - Page 1

Page last updated: 3/2016
What is Meiosis?
Meiosis is the type of cell division that produces gametes, sperm or eggs, in sexually reproducing organisms. Meiosis reduces the number of chromosome by half, so that when a sperm fertilizes an egg, the resulting zygote has a full set of chromosomes. 

Ploidy: Diploid & Haploid
Most of the cells in your body are somatic cells that have a diploid (2n) chromosome number, for humans that's a total of 46 chromosomes. 

During meiosis there are two cell divisions of a diploid (2n) germ cell, resulting in four haploid (n) gametes.

Gametic Life Cycle
Meiosis I & II
As is the case in mitosis, in meiosis the cell duplicates its chromosome number prior to beginning cellular division (a process called replication). Then nuclear division, the sorting out of the genetic material, begins and unfolds over the course of 2 cellular divisions (meiosis I and meiosis II), resulting in 4 gametes.

Meiosis I
During meiosis I, pairs of chromosomes buddy up at the cell’s equator and then each moves to opposite ends of the cell. What started with one cell, now consists of two cells that each have a 23 duplicated chromosomes.

Meiosis I results in two cells that now have half the number of chromosomes, but those chromosomes are still duplicated. The role of meiosis II is to separate the duplicated chromosomes, resulting in four sex cells (gametes) with half the number of chromosomes (unduplicated) as the parent cell.

Since meiosis produces haploid gametes, you received a set of 23 chromosomes from your mother’s egg and a matching set of 23 from your father's sperm.  

Meiosis II
Meiosis II unfolds much like mitosis does, but without the chromosomes replicating before nuclear division. Each duplicated chromosome left over from meiosis I lines up at the two cells' equators and these sister chromatids (as the duplicates are called) separate and move to opposite poles. Meiosis II ultimately results in 4 cells that, in humans, each have 23 (1n) chromosomes.

Overview of meiosis illustration
​Fun Video on Meiosis from 
Crash Course Biology 
Virtual Microbiology
Classroom







You have free access to a large collection of materials used in a college-level introductory microbiology course. The Virtual Microbiology Classroom provides a wide range of free educational resources including PowerPoint Lectures, Study Guides, Review Questions and Practice Test Questions.
Prokaryotic Cell, Mariana Ruiz
Dominant Genetic Trait of Tongue Rolling
LECTURE NOTES 
from the free STEM 
education site 
Science Prof Online
This article has 
3 pages: 
1  .  2 .  3
LECTURE NOTES 
from the free STEM 
education site 
Science Prof Online