Sperm

spermatid
male cell that arises by division from a secondary spermatocyte and that later gives rise to a sperm
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby ...
Full article >>>

Spermiogenesis
This is the metamorphosis of spherical spermatids into elongated spermatozoa. No further mitosis or meiosis occurs.
Full article >>>

Spermatocyte
[Gr. spermatos - seed, semen; Gr. kytos - a hollow vessel; modern usage cyt- denotes a cell].
Full article >>>

(1) (Zoological) A cell which undergoes meiosis and thereby produces spermatids. See primary spermatocyte and secondary spermatocyte.
Full article >>>

The spermatids at this point are still round cells. During the process called spermiogenesis the sperm extrude tails, repackage DNA into a head, ...
Full article >>>

Search for gymnosperm in these other databases too
Definition of gymnosperm :
a vascular plant that bears naked seeds not enclosed in any specialized chambers.
Full article >>>

sperm that are motile (and small)
eggs that contain food.
Sex Organs of the Human Male
The reproductive system of the male has two major functions: ...
Full article >>>

Spermatogenesis occurs in seminiferous tubules in testes.
The cell that undergoes meiosis is a primary spermatocyte.
Full article >>>

Sperm pass through the vas deferens and connect to a short ejaculatory duct that connects to the urethra. The urethra passes through the penis and opens to the outside.
Full article >>>

Sperm competition in 13 lined ground squirrels
Mimics: a classic textbook example trashed
How do squirrels "know" 3.8 is the magic number?
Full article >>>

spermatogonia: primitive cells within the seminiferous tubules that undergo a series of changes and then meiosis to yield sperm cells.
sperm cells: haploid cells within the male testes.
Full article >>>

Sperm and eggs are made from special cells called germ cells. (The word "germ" is from the Latin word for "seed" or "bud".) Germ cells are found in the male's testes and in the female's ovaries.
Full article >>>

spermatophyte -- A seed plant.
spicule -- Crystalline or mineral deposits found in sponges, sea cucumbers, or urochordates. They are structural components in many sponges, and may serve a protective function in other organisms.
Full article >>>

spermatogenesis
The continuous and prolific production of mature sperm cells in the testis.
sphincter ...
Full article >>>

spermatium Minute, nonmotile male gametes that occur in the rust fungi.
spermatocyte A growth stage of a male reproductive cell; gives rise to a spermatid.
Full article >>>

spermatids
A haploid stage in male gametogenesis.
Covered in Lab 14 Gametogenesis and Development
spermatogenesis
the continuous and prolific production of mature sperm cells in the testis via meiosis.
Full article >>>

Endosperm
Triploid tissue in a seed, formed from fusion of two haploid female and one haploid male nucleus.
Related Terms: Haploid ...
Full article >>>

endosperm. The tissue containing stored food in a seed that surrounds the embryo and is eventually digested by the embryo as it grows.
Full article >>>

Angiosperm
: The most recently evolved and the largest group of plants whose reproductive organs are in their flowers (flowering plants). A
superclass ...
Full article >>>

He donated sperm to fellow musician Melissa Etheridge so that she and her lesbian partner could have a baby.
Solo discography of David Crosby: ...
Full article >>>

The nucleus of a sperm or an egg prior to fertilization. Sperm and egg cells carry half the number of chromosomes of other nonreproductive cells.
Full article >>>

Pinaceae Gymnosperm family in which the leaves are needle-shaped
(pine; -aceae = ending for plant families)
Pistil a "female" plant part consisting of ovary style and stigma
(pistillum pestle = to pound beat) ...
Full article >>>

Artificial insemination -- the placement of sperm into a female reproductive tract or the mixing of male and female gametes by other than natural means. Autosome -- a nuclear chromosome other than the X- and Y-chromosomes.
Full article >>>

A haploid sex cell, egg or sperm, that contains a single copy of each chromosome. GEM. A genetically engineered microorganism. Gene. A locus on a chromosome that encodes a specific protein or several related proteins.
Full article >>>

gametes Reproductive cells (sperm or egg) which are haploid. gangliosides Sphingolipids containing complex oligosaccharides as head groups.
Full article >>>

In some cases, the first mutation is already present in a germ line cell (egg or sperm); thus, all the cells in the individual inherit it. Because the mutation is recessive, the trait is not expressed.
Full article >>>

At about the same time, it was also discovered that during the formation of egg and sperm cells, a cell division occurs without prior doubling of the number of chromosomes.
Full article >>>

capacitation - change in mammalian sperm that occurs after exposure to female genital tract making the sperm competent to undergo the acrosome reaction; this change is necessary for penetration of the cumulus matrix and for fertilization.
Full article >>>

Meiosis: the process of cell division in which a single cell produces four daughter cells each of which contains half of the number of chromosomes of the parent cell. For example, a single diploid spermatogonium (primordial germ cell) will divide ...
Full article >>>

Haploid: A single set of chromosomes (half the full set of genetic material), present in the egg and sperm cells o f animals and in the egg and pollen cells of plants. Human beings have 23 chromosomes in their sex cells. Compare to diploid.
Full article >>>

For example, males produce two types of gametes or sperm, one with an X chromosome and another with a Y chromosome.
Full article >>>

Illustrate outcome of meiosis (egg and sperm.)
Understand relationship
between chromosomes, ...
Full article >>>

Haploid: A single set of chromosomes (half the full set of genetic material), present in the egg and sperm cells of animals and in the egg and pollen cells of plants. Human beings have 23 chromosomes in their reproductive cells. Compare diploid.
Full article >>>


'"/>