Meiosis

Meiosis
Chromosome abnormalities usually happen as a result of an error in cell division. Meiosis is the name used to describe the cell division that the egg and sperm undergo when they are developing.

Meiosis -- The cell division, peculiar to reproductive cells, which allows genetic material to divide in half. Each new cell will contain twenty-three chromosomes.

meiosis - the cell division process that eggs and sperm go through which halves the chromosome number from 46 to 23.
Mendel - An Austrian monk who performed experiments on garden peas to understand inheritance patterns.

Meiosis - The type of cell division that forms eggs or sperm in sexually reproducing organisms. This process takes place during the embryonic phase of development.

Involvement of anticentromere antibody in interference with oocyte meiosis and embryo cleavage.
Fertil Steril. [Abstract] [Full-text]
Postoperative inflammation in the abdominal cavity increases adhesion formation in a laparoscopic mouse model.

Meiosis The process of two consecutive nuclear divisions in the formation of gamete cells, by which the number of chromosomes is reduced from the diploid, or double, number found in somatic cells to the haploid, or halved, ...

How Chromosome Abnormalities Happen: Meiosis, Mitosis, Maternal Age, Environment
Chance a Chromosome Abnormality Will Occur Again: Numerical, Structural (Inherited and De Novo), Mosaicism ...

It's thought that the ovum goes through a third meiosis creating an original and daughter germ cell which are then fertilized by two different sperm. There is one animal, I think it's the hippopotumus or Rhino that always twins in this way.

A "primary oocyte" has not yet completed its first maturation division. A "secondary oocyte" has completed its first division (via meiosis). It usually stops short of completing a second division unless fertilization occurs.
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These cells are produced by meiosis in the ovaries and stay in a state of suspended animation until activated by hormonal changes in the woman's menstrual cycle. Typically, only one ovum is released during each menstrual cycle.

If they occur during mitosis, after conception, for instance, and during life, they are known as somatic mutations. If they happen during meiosis, in producing the egg or sperm, they are referred to as germ line mutations and, as such, ...

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See also: Pregnancy, Genetic, Sperm, Chromosome, Diagnosis