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Sperm in Biological Dictionary

Sperm

The term sperm is derived from the Greek word (σπέρμα) sperma and refers to the male reproductive cells. In the types of sexual reproduction known as anisogamy and oogamy, there is a marked difference in the size of the... The sperm whale, Physeter macrocephalus, is a species of mari...

Zona pellucida

...ound the mammalian ovum; can be penetrated by one sperm in the fertilization process; usually remains a...ent ... THE ZONA PELLUCIDA : ... Binding of sperm to the zona pellucida is a receptor-ligand in...ame zona pellucida protein that serves as a sperm receptor also stimulates ... The zona pel...

Vitelline membrane

...tein fibers, with protein receptors needed for sperm binding, binding to sperm plasma membrane receptors. The species-specif... coat/ vitelline layer. ... Thus, any additional sperm are released from the vitelline membrane and ...

Vas deferens

...he male anatomy of some species; they transport sperm from the epididymis in anticipation of ejaculat...Vas deferens - The 2 muscular tubes that carry sperm from the testicle and ... The male reproductiv...he vas deferens is a coiled duct that conveys sperm from the epididymis to the ... A duplicate ...

Uropod

...ences structure of crustaceans ( in crustacean (arthropod): Appendages; ...crabs and crayfish the first two pairs in the male are modified to help in sperm transfer during mating. The last pair of abdominal limbs is frequently different from the others and is... Morphology of a crayfish: edible freshw...

Testes

... organ or body system. ... Testes : The male reproductive glands where sperm are produced. ... Detailed information on undescended testes , includi...o egg-shaped male reproductive organs located in the scrotum. They produce sperm and the male hormone, testosterone. ... Gray, Henry. 1918. Anatomy of t...

Syngamy

... Scientific article describing fertilization, the union of an ovum and sperm usually occurring ... grains of pollen are necessary for syngamy with each ovule. ... Definition of syngamy from the Merriam-Webster Online ...

Synergid

...n angiosperms. ... the micropylar pole, the synergid cell wall is extensively ... tube and synergid ) forms the milieu in which the nonmotile sperm ... synergid receptivity and pollination are correlated (Jensen et al. ... synergid becomes electron dense, the plasma membrane. breaks do...

Spermiogenesis

...www.yourdictionary.com/ spermio genesis . Comments: ... During spermiogenesis , histones are displaced from nucleosomes to form DNA ... Steps Of sperm Cell Formation During Spermiogenesis ... In spermiogenesis , each immature spermatocyte develops an acrosome, and tail, ... regulation of sperm...

Spermatogonia

...lly are the male ... ... seminiferous tubules consist of diploid spermatogonia , stem cells that are the ... spermatogonia to stimulate sperm production (aided by the LH needed for ... Isolation of pure type A spermatogonia (among them spermatogonial stem cells) ... In principle, the...

Spermatids

...s, early spermatids " ... This is a picture of undifferentiated sperm cells, or spermatids , from C. elegans. ... Each spermatid is around 5 ... ... genes encode proteins located in human late spermatids and in sperm tails. ... proteins in the RNA metabolism of late spermatids , presum...

Spermatogenesis

... during spermatogenesis . 5. Mutants that affect sperm meiosis ... Spermatogenesis is the process that creates sperm from initially ... The period of spermatogene... Spermatogenesis is the process of producing sperm with half the number of ... This part of spermat...

Sperm cells

... The term sperm is derived from the Greek word (σπέρμα) sperma an...is a marked difference in the size of the... A sperm , from the ancient Greek word σπέρμα (seed) and ζῷον (living being) and more commonly known as a sperm cell, is the haploid cell that is the male ga...

Somatic cells

... to produce a cell called a zygote, from which the entire mammalian embryo develops. Every other cell type in the mammalian body—apart from the sperm and ova, the cells from which... The term somatic refers to cells of the body, rather than gametes (eggs or sperm). In humans, somatic c...

Somatic cell

...yo develops. Every other cell type in the mammalian body—apart from the sperm and ova, the cells from which... In genetics and developmental biol... ... where somatic refers to cells of the body (not the germ cells , sperm or eggs) ... become a specific cell type, it is now possible to reprogra...

Somatic

... to produce a cell called a zygote, from which the entire mammalian embryo develops. Every other cell type in the mammalian body—apart from the sperm and ova, the cells from which... The Center for Somatic Studies is founded on the principle that movement processes are the root of all psycho...

Sex chromosomes

... A human somatic cell has two sex chromosomes : XY in male and XX in female. A human germ cell has one sex chromosome : X or Y in a sperm and X in an egg. ... ...

Sex cells

...eiosis and differentiation into either eggs or sperm . Plants do not have a germ line set aside in e...number of chromosomes, ... A sex cell , either sperm or egg, capable of fusing with another gamete o...Health ... Eggs (also called ova or oocytes), and sperm are called " Sex Cells " ... Sex cells a...

Semen

...ld anyone know it came from seven different guys? ... Semen Detection, sperm Detections, Saliva Detections for Infidelity or Rape by Prostate Specific A... of your ... Biologically speaking, the main purpose of semen is to help sperm survive their ... Are you facing problems with conceiving on account of...

Seedless vascular plants

...t desiccation: ... 4 phyla of seedless vascular plants : A. Phylum Psilotophyta (only 2 ... Chapter 19 -- SEEDLESS VASCULAR PLANTS ... sperm of seedless vascular plants still require water in order to swim to the egg. ... ... well understood vascular plants . seedless . simpl...

Preformation

...ica online encyclopedia article on preformation theory (biology), ...the entire future development of an animal is centred in the egg, and that sperm merely ... Science for People -- news from the lab without a lot of jargon. ... said Theo, "You're thinking of preformation - the idea that an ...

Post-meiotic segregation

...gation increased 2) is a DNA mismatch repair protein ... nonpolyposis colorectal cancer type 4, PMSL2, postmeiotic segregation like 2. ... sperm meiotic segregation studies performed in ... Meiotic segregation ... abnormal chromosome content, or post - meiotic selection of some ge...

Pollen tube

...most seed plants acts as a conduit to transport sperm cells from the pollen grain, either from the ...ard coat covering the pollen grain protects the sperm cells during the process... The pollen tu...... Each pollen tube carries two nonmotile sperm thar are bound for egg-bearing ... This isn't the...

Pollen grain

...ard coat covering the pollen grain protects the sperm cells during the process... pollen n. The ... pollen grain with its hard coat protects the sperm cells during the process ... The smallest poll...lants (see ... Each pollen grain contains two sperm nuclei and one tube nucleus. ... ... pollen ,...

Polar nuclei

... nucleus is fertilized by one of the sperm, the other unites... ... sperm combines with the two polar nuclei of the large central cell of ... cell of the embryo sac contains two polar nuclei . ... The other sperm cell fertilizes a part of the ovary called the polar nuclei . The ...

Polar body

...ns, thesaurus, Word of the Day, and word games. Semi-identical twins are the result of a very rare form of ... in in polar body twinning where sperm cells fertilize both the ovum and the second polar body . ... Bear: body features of polar bears ... Polar body - Wikipedia, the fr...

Parthenogenesis

... ... Parthenogenesis , a form of asexual reproduction in which a new organism develops ... Parthenogenesis - Can Two Women make a Baby with No sperm ... science, parthenogenesis , shark, virgin, virgin-birth ... science, vinesci, parthenogenesis , reproduction, sharks, genetics, female-shark, ...

Ovum

...f independent artists and programmers. ... ovum - 19 definitions - (n) 1. a pluralization of ovum . ... As soon as the nuclie of the ovum and sperm fuse, they create a new diploid ... Gray, Henry. 1918. Anatomy of the Human Body. I. Embryology. 2. The Ovum ... The ovum is enclosed within...

Ovule

...dio pronunciations, thesaurus, Word of the Day, and word games. Ovule - Definition of Ovule at Dictionary.com a free online dictionary with ... sperm from pollen grains enter the ovule through an opening called a micropyle ... Ovule literally means "small egg. ... ovule (plant anatomy) --...

Oviducts

... oviducts that fertilization (the union of the sperm cell and ovum) occurs. ... Why female dogs s... oviducts that fertilization (the union of the sperm cell and ovum) occurs. ... ster oviducts i... oviducts that fertilization (the union of the sperm cell and ovum) occurs. ... Adding another la...

Oviduct

...e from the ovaries to the outside of the body is known as the oviduct . The eggs travel along the oviduct . These eggs will either be fertilized by sperm to become a zygote, or will degenerate in the body. oviduct ( ) n. A tube through which the ova pass from the ovary to the uterus or ... Wha...

Ootid

... ... ootid - mature ovum after penetration by sperm but before the formation of ... Definition of ...es. ootid mature ovum after penetration by sperm but before the formation of a zygote ... number...d: ootid . n. mature ovum after penetration by sperm but before the formation of ... PROTOTYPE PAGE, S...

Oocytes

...final stages of ... MI oocytes have already undergone the process of germinal vesicle breakdown ... Preparation of Oocytes for Fertilization. sperm Purification (Percoll Centrifugation) ... Transfer of Fertilized Oocytes into Embryo Culture Drops ... Denuded oocytes from immature eCG-primed...

MtDNA

...sis, sequence analysis of medically significant genes, a suite of products in the area of molecular genealogy Tuesday, I referred to mtDNA and sperm evolution. ... There has been recent interest in the coinheritance of sex chromosomes and mtDNA . ... ...

Microgametophyte

...te : The pollen consists of more than just a single, elaborate cell. ... "The microgametophyte (pollen) is the male gametophyte, containing (the) 2 sperm ... ... one Microgametophyte . Each Microgametophyte produces one ... Microgametophyte . The Endosporic Development of the Antheridium means t...

Megagametophyte

...cture is Embryo. sac. Integument. Egg apparatus: ... ... each ovule and develops into a multi-nucleated megagametophyte . ... The fusion of two sperm nuclei with megagametophyte nuclei is called double fertilization. ... ...

Mature ovum

...m at Encyclopedia.com. ... The union of mature sperm and ovum , each bearing half the normal number o... is thus released, it is available to a mature sperm for ... The best or most fertile time to get p...eatment ... In humans, each mature ovum or sperm must include only 23 single (not paired) chromoso...

Infundibulum

... into an anterior infundibulum , middle ... infundibulum (or "tuba") or the vagina of a variety ... in the posterior infundibulum although sperm may ... Infundibulum and Rathke's pouch of the pituitary gland showed hybridization signal as well. ... diencephalon into the infundibulum ...

Infertility

...tility? ... We explore the different kinds of infertility , what can be done, costs involved, ... Cases of total infertility – where no eggs or sperm are produced – are rare. ... Detailed information on infertility , including causes, diagnosis, and treatment ... Infertility affects about 12 ...

In vitro

...sh. Many experiments in cellular biology are conducted... In vitro fertilisation (IVF) is a process by which egg cells are fertilised by sperm outside the womb, in vitro . IVF is a major treatment in infertility when other methods of assisted reproductive technology have failed. The... ...
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