Dictionary > Meiotic spindle

Meiotic spindle

Definition
noun
The collective term for all the spindle fibers that form during meiosis
Supplement
The spindle apparatus is the collective term for all the spindle fibers that form during mitosis or meiosis. These spindle fibers are responsible in moving and segregating the chromosomes during nuclear division. The spindle apparatus that forms during mitosis is referred to as mitotic spindle whereas the one that forms during meiosis is called meiotic spindle.
Meiosis is a specialized form of cell division that ultimately gives rise to non-identical haploid sex cells. There are two meiotic divisions and each is comprised of substages: prophase, metaphase, anaphase, and telophase. Depending on the meiotic division, they may be designated as I or II. Meiotic spindle first forms during prophase I. In the next stage, metaphase I, the spindle fibers attach to the kinetochores of the homologous chromosomes aligned along the metaphase plate. In anaphase I, the homologous chromosomes separate as they move apart towards the opposite poles. This movement is through the action of the spindle fibers. In telophase I, the spindle fibers disappear. The meiotic spindle reappears at prophase II. In metaphase II, the kinetochore microtubules attach to the kinetochores of the sister chromatids of each chromosome that line up along the metaphase plate. In anaphase II, the spindle fibers pull the sister chromatids apart and move them towards the opposite poles. In telophase II, the meiotic spindle disappears.
See also:


You will also like...

New Zealand - Biodiversity fauna
New Zealand’s Biodiversity

Find out more about New Zealand's unique biodiversity by exploring a range of different ecosystems and the key role of s..

New Zealand Fauna
New Zealand’s Unique Fauna

Meet some of New Zealand's unique fauna, including endemic insects, frogs, reptiles, birds, and mammals, and investigate..

Fossil trilobite imprint in the sediment
Insects

There are more species of insects than any other species combined. This surely illustrates that insects have the selecti..

Birth of a Human Baby
Birth of a Human Baby

Following nine months inside the mother's womb is the birth of the baby. Know the different stages of the birthing proce..

takahē
Takahē (Porphyrio hochstetteri)

Meet the colorful takahē, an extremely rare flightless bird. Find out more about its unique features and why they matte..

Birth Control and Contraception
Birth Control and Contraception

Different pregnancy and birth control and contraception strategies are described. Read this tutorial to learn each of th..