from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Any of the four haploid cells that are formed by meiosis from a spermatocyte and that develop into spermatozoa without further division.
from The Century Dictionary.
- noun One of the two cells which arise by division of a secondary spermatocyte and give rise by transformation to a spermatozoön. In oögenesis the spermatid is represented by the oötid.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun biology A
haploid cell, produced by meiosisof a spermatocyte, that develops into a spermatozoon
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun an immature gamete produced by a spermatocyte; develops into a spermatozoon
Sorry, no etymologies found.
The nuclear portion of the spermatid, which is partly imbedded in the supporting cell, is differentiated to form the head of the spermatozoön, while part of the cell protoplasm forms the middle piece and the tail is produced by an outgrowth from the double centriole of the cell.
Seven of the mice were born after sperm heads were transferred into 23 eggs using a technique called round spermatid injection, and another five were born after 35 eggs were fertilised using intracytoplasmic sperm injection Icsi, a common IVF procedure.
We discussed spermatogenesis -- how we got from a diploid spermatogonial stem cell to a haploid spermatid -- and then spermiogenesis -- the process by which the spermatids acquire the features of spermatozoa: tails, acrosomes and the like.
Spermiogenesis • Or spermateleosis • The process by which a spermatid becomes a spermatozoon.
Giorgini F, Davies HG, Braun RE (2002) Translational repression by MSY4 inhibits spermatid differentiation in mice.
Vigodner M, Morris PL (2005) Testicular expression of small ubiquitin-related modifier-1 (SUMO-1) supports multiple roles in spermatogenesis: silencing of sex chromosomes in spermatocytes, spermatid microtubule nucleation, and nuclear reshaping.
Each spermatid (22 + X or 22 + Y) gradually change its shape to become spermatozoon.
• Spermiogenesis is the process of transformation of a rounded spermatid into a spermatozoon.
• The spermatid is amore or less circular cell containing a nucleus, Golgi apparatus, centeriole and mitochondria. all these components take part in forming the spermatozoon: 1.
And please take note the Alien looks exactly like the humans that walk on earth, because of the spermatid in the world, that was used to create other ancient worlds.