from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A diploid cell that undergoes meiosis to form four spermatids. A primary spermatocyte divides into two secondary spermatocytes, which in turn divide to form the spermatids.
from The Century Dictionary.
- Of or pertaining to a spermatocyte.
- noun In botany, the mother-cell of a spermatozooid.
- noun The cell whose nuclear chromatin and cell-protoplasm become respectively the head and tail of the spermatozoön: synonymous with spermatoblast.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Physiol.) Same as
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun cytology A male
gametocyte, from which a spermatozoondevelops.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a male gametocyte that develops into four spermatids
Sorry, no etymologies found.
In the cross between banteng and European cattle all F1 bulls are sterile; their sperm development ceases at the secondary spermatocyte stage.
When a spermatogonium was observed to change to a primary spermatocyte-still diploid-it would be segregated and at the instant it divided into two secondary spermatocytes-haploids, one with an X chromosome and one with a Y chromosome-they would be again segregated and each would be encouraged to develop into spermatozoa. \par
In the development of the spermatozoa, as in the maturation of the ovum, there is a reduction of the nuclear chromosomes to one-half of those present in the primary spermatocyte.
On comparing this process with that of the maturation of the ovum (Fig. 7) it will be observed that the primary spermatocyte gives rise to two cells, the secondary spermatocytes, and the primary oöcyte to two cells, the secondary oöcyte and the first polar body.
Each primary spermatocyte divides into two secondary spermatocytes, and each secondary spermatocyte into two spermatids or young spermatozoa; from this it will be seen that a primary spermatocyte gives rise to four spermatozoa.
Difference Between Spermatogenesis and Oogenesis One primary spermatocyte gives rise to
When primary spermatocyte divides, its cytoplasm is equally distributed between the two secondary spermatocytes formed.
What shall be the total no. chromatids in each of the secondary spermatocyte?
Each secondary spermatocyte has (22 +X) or (22 + Y) chromosomes.
Pol β-deficient spermatocytes yielded reduced steady-state levels of the SPO11-oligonucleotide complexes that are formed when SPO11 is removed from the ends of DSBs, and cytological experiments revealed that chromosome-associated foci of replication protein A (RPA), RAD51 and DMC1 are less abundant in Pol β-deficient spermatocyte nuclei.