| 单词 |
spermatid |
| 释义 |
ˈspermatid Biol.
Also -ide.
[f. L. spermat-, stem of sperma sperm + -id.]
A seminal cell which develops into a spermatozoon; spec. one that is formed by the meiotic division of a secondary spermatocyte and develops into a spermatozoon without dividing again.
1889Geddes & Thomson Evol. Sex ix. 113 The sperm or spermatozoon is differentiated from an immature cell or spermatide. 1904Biol. Bulletin Feb. 150 There is the normal number of two chromosomes. The ovotid and the spermatid have each only one. 1924E. W. Macbride Study of Heredity ii. 46 In the case of the male cell each secondary spermatocyte divides into two precisely equal cells called spermatids. 1959[see spermatogonium s.v. spermato- 1]. 1968New Scientist 2 May 218/2 It now appears that the X and the Y chromosomes become genetically inert before the spermatids (the cells from which the spermatozoa develop) are formed.
Hence sperˈmatidal a.
1975Biochem. & Biophysical Res. Communications LXVII. 183 Proteins extracted from elongated spermatids..reveal the presence of a new spermatidal basic protein fraction. |
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