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 ...
Spermatogenesis
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Spermatocyte
[Gr. spermatos - seed, semen; Gr. kytos - a hollow vessel; modern usage cyt- denotes a cell].
The spermatids at this point are still round cells. During the process called spermiogenesis the sperm extrude tails, repackage DNA into a head, ...
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Definition of spermatogenesis :
The process of sperm production.
Angiosperm
(Science: botany) a flowering, fruit-bearing plant or tree, the ovules (and therefore seeds) of these plants develop within an enclosed ovary. Plants having seeds in a closed ovary.
The Spermatozoön
The spermatozoa or male germ cells are developed in the testes and are present in enormous numbers in the seminal fluid. Each consists of a small but greatly modified cell.
A cell that undergoes the first meiotic division in male animals. See secondary spermatocyte.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ...
Spermacides
chemicals, such as nonoxynol 9, that inactivate sperm. Inserted into the vagina - often incorporated in sponge - prior to intercourse.
Hormonal Contraception ...
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.
spermatogenesis
The continuous and prolific production of mature sperm cells in the testis.
sphincter ...
Sperm competition in 13 lined ground squirrels
Here's number seven in my series. It's about sperm competition and male mate choice in 13 lined ground squirrels.
sperm
Spermatozoon; a small, usually motile male gamete.
Covered in BIOL1020 Lab 6 Mitosis & Meiosis
spermatic artery
Arise from the abdominal aorta just posterior to the kidneys and supplies the testes with oxygenated blood.
Spermatogenesis
Spermatogenesis occurs in seminiferous tubules in testes.
endosperm A food storage tissue that provides nutrients to the developing embryo in angiosperms; formed from the triploid cell produced when a sperm cell fertilizes the central cell.
endosperm. The tissue containing stored food in a seed that surrounds the embryo and is eventually digested by the embryo as it grows.
Angiosperm: The most recently evolved and the largest group of plants whose reproductive organs are in their flowers (flowering plants).
Angiosperm Life Cycle
Flowering plants also exhibit the typical plant alternation of generations, shown in Figure 11.
Sperm
The male gamete.
Related Terms:
Gamete
Mature male or female reproductive cell (sperm or ovum) with a haploid set of chromosomes (23 for humans).
Sperm are stored in the _________, ascend into the __________ prior to ejaculation, and are discharged from the penis through the __________.
A.
seminiferous tubules, prostate gland, vas deferens.
Sperm are some of the most active cells in the body, their motility responsible for getting them to the site of an ovum for fertilization.
Sperm and eggs from the same species have the same number of chromosomes. However, the sperm is specialized for motility and has a nucleus to hold the chromosomes but has almost no cytoplasm.
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.
Sperm and egg cells and their precursors. Germ cells are haploid and have only one set of chromosomes (23 in all), while all other cells have two copies (46 in all).
Germ line ...
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.
Endosperm
Triploid tissue in a seed, formed from fusion of two haploid female and one haploid male nucleus.
Related Terms:
Haploid ...
Angiosperm Phylogeny website glossary:Glossary of botanical terms.
Taxonomy
NCBI Taxonomy: Search and browse NCBI's database of organisms.
PLCz, a sperm-specific PLC and its potential role in fertilization
Christopher M. Saunders *, Karl Swann † and F. Anthony Lai1 * ...
Gamete A sperm or an ovum.
Gene In Mendelian terms - a unit of inheritance. In molecular terms - a region of DNA which contains the information to create either a functional RNA or a polypeptide chain.
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) ...
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.
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.
>about a sperm or an egg cell? Don't these have the potential to become
>a new life? I don't believe so. It is that beautiful moment of
>fertilization that makes all the difference. The information and ...
Gamete Mature male or female reproductive cell (sperm or ovum) with a haploid set of chromosomes (23 for humans).
Gene The fundamental physical and functional unit of heredity.
They result from the fertilization of a single egg with a single sperm. And as those cells divide and multiply, at some point very early in embryonic growth they split into two individuals.
Typically, a sperm carries mitochondria in its tail as an energy source for its long journey to the egg. When the sperm attaches to the egg during fertilization, the tail falls off.
Technically, it is much easier to prepare DNA cleanly from sperm than from other cell types because of the much higher ratio of DNA to protein in sperm and the much smaller volume in which purifications can be done.
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.
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 ...
The cells of the body involved in reproduction. Sperm of the male and eggs of the female are formed from germ cells.
Source : Human Genome Project Information
Golgi complex (Golgi apparatus) ...
Meiosis (my-OH-sis) The type of cell division that makes egg and sperm cells. Meiosis generates cells that are genetically different from one another and contain half the total number of chromosomes in the parent cell. See haploid.
It was then that scholars discovered spermatozoa, bacteria, infusoria and the sheer strangeness and diversity of microscopic life.
gametes - reproductive cells; sperm and egg cells in animals.
gene - section of a chromosome which codes for a protein or RNA product.
Recombination occurs naturally in plants and animals during the production of sex cells (sperm, eggs, pollen) and their subsequent joining in fertilization. In microbes, genetic material is recombined naturally during conjugation.
Fertilization: The joining or fusion of the male gamete (sperm) and the female gamete (egg) to form a zygote during sexual reproduction. See also gamete, zygote.
dough stage - phenological descriptor of seed maturation indicating endosperm development is coming to completion; period between the gel stage and shuck split in pecan ...
The sporophyte is a stalk that grows after the haploid sperm of one moss plant is able to mix with the haploid egg of a female moss plant. The resulting diploid cell grows into the sporophyte stalk.
Germline cells: Cells that contain inherited material that comes from the eggs and sperm, and that are passed on to offspring.
 See also: Cells, Human, Organ, Cell, Trans
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