spermatids

And while spermatids carry only one-half the genetic material of a fully grown sperm, studies show that when combined with an egg which also contains half of the genetic material needed to make a baby in a laboratory procedure, fertilization will result.

Getting Pregnant Niels H. Lauersen 2000

As a result, his testicles may be filled with what are called “spermatids” or “round cells”—sperm buds, as you might call them.

Getting Pregnant Niels H. Lauersen 2000

Containing only the germ of a sperm cell, spermatids are devoid of a tail, meaning they cannot move.

Getting Pregnant Niels H. Lauersen 2000

Scheme showing analogies in the process of maturation of the ovum and the development of the spermatids (young spermatozoa).

Illustrations. Fig. 7 1918

The spermatids are small polyhedral cells, the nucleus of each of which contains half the usual number of chromosomes.

XI. Splanchnology. 3c. The Male Genital Organs 1918

Most of these cells are in a condition of karyokinetic division, and the cells which result from this division form those of the next layer, the spermatoblasts or spermatids.

XI. Splanchnology. 3c. The Male Genital Organs 1918

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.

I. Embryology. 3. The Spermatozoön 1918

This investigator found that there were 48 chromosomes in the female cell, 47 in the male; after the reduction divisions the unfertilised ova had 24 chromosomes, half the spermatids 24 and half 23, so that sex is determined in man by the spermatozoon.

Hormones and Heredity J. T. Cunningham 1897

Perhaps the most striking of all this series of observations is that lately made by T.H. Morgan, [69] since confirmed by von Baehr, that in a Phylloxeran two kinds of spermatids are formed, respectively with and without an accessory (in this case, _double_) chromosome.

Evolution in Modern Thought Gustav Schwalbe 1880

Seminiferous tubules showed disruption of the normal spermatogenic cycle with abnormal acrosomal development on round spermatids, clumping of acrosomes, misaligned spermatids and the absence of normal elongated spermatids in Ehd1 -/- males.

BioMed Central - Latest articles Mark Rainey 2010