Cells in different stages of meiosis
Reviewed by: Mary Anne Clark, Ph.D.
The genetic information found in DNA is essential in creating all the characteristics of an organism. This remains the case when passing genetic information to offspring, that can occur via a process called meiosis where four haploid cells are created from their diploid parent cell.
For a species to survive, and genetic information to be preserved and passed on, reproduction must occur. This can be done by passing on the information found in the chromosomes via the gametes that are created in meiosis.
Humans are diploid creatures, meaning that each of the chromosomes in our body are paired up with another.
Haploid cells possess only one set of a chromosome. For example, a diploid human cell possesses 46 chromosomes and a gamete created by a human is haploid possesses 23 chromosomes.
Reproduction occurs in humans with the fusion of two haploid cells (gametes) that create a zygote. The nuclei of both these cells fuse, bringing together half the genetic information from the parents into one new cell, that is now genetically different from both its parents.
This increases genetic diversity as half of the genetic content from each of the parents brings about unique offspring, which possesses a unique genome presenting unique characteristics. Meiosis is a process can increase genetic variation in many ways, explained soon.
The process of meiosis essentially involves two cycles of division, involving a gamete mother cell (diploid cell) dividing and then dividing again to form 4 haploid cells. These can be subdivided into four distinct phases which are a continuous process
At this stage, two haploid cells have been created from the original diploid cell of the parent.
Overall, this process of meiosis creates gametes to pass genetic information from parents to offspring, continuing the family tree and the species as a whole. Each of these gametes possesses unique genetic information due to situations in meiosis where genetic diversity is increased.
The next tutorial describes the independent assortment of chromosomes and crossing over as important events in meiosis. Read it to know how they promote genetic diversity in sexually-reproducing organisms.
|MEIOSIS STAGES – DRAW THE CHROMOSOMES |
An artistic way to learn about meiosis! Print this worksheet to draw the homologous chromosomes in the different stages of meiosis — from prophase I to telophase II. This will help the students master the highlights of each meiotic stage.
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