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Topic: Gamete


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In the News (Thu 23 May 19)

  
  Gamete - Wikipedia, the free encyclopedia
Gametes, from the ancient Greek γαμετης (spouse), are the specialized germ cells that come together during fertilization (conception) in organisms that reproduce sexually.
Gametes from a mature diploid individual will be produced in the gonadal tissue through meiosis—a process of cellular division that reduces the number of sets of chromosomes from two to one (i.e., produces haploid gametes).
A gamete's chromosomes are not exact duplicates of either of the sets of chromosomes carried in the somatic cells of the individual that produced the gametes.
en.wikipedia.org /wiki/Gamete   (527 words)

  
 Gamete - Biocrawler   (Site not responding. Last check: 2007-11-05)
Gametes (in Greek: γαμέτες) —also known as sex cells, germ cells, or spores—are the specialized cells that come together during fertilization (conception) in organisms that reproduce sexually.
In those species that produce two morphologically distinct types of gametes, and in which a particular individual produces only one type, "females" of the species produce the larger gamete called an ovum (or egg) and "males" produce the smaller gamete termed (in animals) a spermatozoon (or sperm).
After fusion of the two gamete nuclei, and after multiple cell divisions and cellular differentiation, a zygote develops, first into an embryo, and ultimately into a mature individual capable of producing gametes.
www.biocrawler.com /encyclopedia/Gamete   (525 words)

  
 gamete - Hutchinson encyclopedia article about gamete   (Site not responding. Last check: 2007-11-05)
In most organisms, the gametes are haploid (they contain half the number of chromosomes of the parent), owing to reduction division or meiosis.
In higher organisms, gametes are of two distinct types: large immobile ones known as eggs or egg cells (see ovum) and small ones known as sperm.
In some lower organisms the gametes are all the same, or they may belong to different mating strains but have no obvious differences in size or appearance.
encyclopedia.farlex.com /gamete   (151 words)

  
 Gametogenesis and gamete interaction during fertilization
The leading role in the sperm-egg encounter is played by the molecular organization of their surfaces, and abundant evidence suggests that the species-specific gamete recognition and binding is mediated by receptor molecules at the gamete surface.
Sperm binding to the egg surface occurs on the lateral face of the head, with the firm point of attachment between the sperm and egg plasma membranes occurring at the equatorial segment.
The pronuclear development in fertilized eggs is known to proceed through a series of transformations, which restore the transcriptional competence of the inactive gamete chromatin and re-establish the functional diploid genome of the embryo.
www.gfmer.ch /Books/Reproductive_health/Gametogenesis_and_gamete_interaction_during_fertilization.html   (2963 words)

  
 gamete on Encyclopedia.com   (Site not responding. Last check: 2007-11-05)
Segregation at microsatellite loci in haploid and diploid gametes of Musa.
Gamete selection for resistance to common and halo bacterial blights in dry bean intergene pool populations.
Gamete spawning and fertilization in the gymnolaemate bryozoan Membranipora membranacea.
encyclopedia.infonautics.com /html/X/X-gamete.asp   (555 words)

  
 Gamete and Embryo Donation - Adoption Council of Canada/ Conseil d'Adoption du Canada
The numbers of children and adults conceived from gamete donation can only be estimated as there are no legal requirements to maintain permanent records, and it has not been unusual for information to be destroyed after a birth has occurred.
There is also controversy regarding the issue of whether donors of gametes and embryos should be paid, a practice the federal government has stated it intends to prohibit on the grounds that it is contrary to the dignity of human life.
These arguments tend to create fear and suspicion, and deflect attention away from the larger issues in gamete donation, namely, the needs of families and the rights of offspring to truth and honesty about their genetic origins.
www.adoption.ca /viewpoints/gamete.htm   (701 words)

  
 Gamete at opensource encyclopedia   (Site not responding. Last check: 2007-11-05)
Gametes, also known as sex cells or germ cells, are the cells that come together during fertilization or conception in organisms that reproduce sexually.
The gametes of females are called eggs (or ova), the gametes of males are called sperm.
A gamete's chromosomes are not duplicates of either of the sets of chromosomes that are carried in the somatic cells of the individual that produced the gametes.
www.wiki.tatet.com /Gamete.html   (237 words)

  
 Genetics Glossary GH   (Site not responding. Last check: 2007-11-05)
Gametes from parents of opposite sexes fuse to form zygotes.
A specialized haploid cell that fuses with a gamete from the opposite sex or mating type to form a diploid zygote; in mammals, an egg or a sperm.
All of the alleles available among the reproductive members of a population from which gametes can be drawn.
helios.bto.ed.ac.uk /bto/glossary/gh.htm   (3201 words)

  
 Gamete and embryo quality
The concept of embryo quality is difficult to define but we cannot assert that embryo quality is optimal unless two criteria are met: (1) a chronologically and morphologically regular cleavage occurs which is necessary, but not sufficient, and (2) viable offspring develop after embryo transfer.
The future of the embryo is difficult to evaluate on the basis of gamete quality; in some cases, even if fertilization has occurred, no further development may occur.
The present study by classical cytogenetic and FISH techniques was designed to estimate chromosome abnormalities in human gametes in order to assess the contribution of oocytes and spermatozoa, the aberration ratio at the zygotic stage, and during the first steps of development following coculture.
www.gfmer.ch /Books/Reproductive_health/Gamete_and_embryo_quality.html   (1736 words)

  
 Gamete and zygote intrafallopian transfer (GIFT and ZIFT) for infertility
Some infertile couples are affected by conditions that prevent the sperm and egg from traveling through a fallopian tube, where fertilization and the first stage of cell division take place.
Gamete intrafallopian transfer (GIFT) uses multiple eggs collected from the ovaries, which are placed into a thin flexible tube (catheter) along with the sperm to be used.
The gametes (both eggs and sperm) are then injected into the fallopian tubes using a surgical procedure under general anesthesia called laparoscopy.
www.webmd.com /hw/infertility_reproduction/hw202763.asp   (1268 words)

  
 Gamete articles on Encyclopedia.com   (Site not responding. Last check: 2007-11-05)
It is the female sex cell, or female gamete; the male gamete is the sperm.
sperm SPERM [sperm] or spermatozoon, in biology, the male gamete (sex cell), corresponding to the female ovum in organisms that reproduce sexually.
isogamy ISOGAMY [isogamy], in biology, a condition in which the sexual cells, or gametes, are of the same form and size and are usually indistinguishable from each other.
www.encyclopedia.com /SearchResults.aspx?Q=Gamete   (435 words)

  
 Gamete intrafallopian transfer (GIFT) definition - Medical Dictionary definitions of popular medical terms
Gamete intrafallopian transfer (GIFT): A technique in which the male and female germ cells required to begin formation of a human embryo are injected into a woman's fallopian tubes of the female for fertilization.
Gametes (germ cells) in males are the spermatozoa, or sperm, and those in females are ova, or eggs.
"Gamete" is derived from the Greek word "gamete" (wife) and "gamein" (to marry).
www.medterms.com /script/main/art.asp?articlekey=12288   (292 words)

  
 SIRM: Gamete Intrafallopian Transfer (GIFT)   (Site not responding. Last check: 2007-11-05)
Gamete intrafallopian tube transfer is usually done through laparoscopy.
It was initially believed that injection of the male and female gametes into the fallopian tubes during GIFT might increase the risk of tubal pregnancies.
However, statistics have not borne out this concern in cases in which the tubes are apparently normal in configuration and where no other pelvic disease is present.
www.haveababy.com /infert/gift.asp?site=   (995 words)

  
 glossary
A reproductive cell or germ cell (in plants the ova and pollen grains), usually haploid in chromosome number, and capable of uniting with another gamete of the opposite sex to form a new plant or animal.
The sexual cell in the life cycle of a protozoon which gives rise to a gamete when taken into the body of the vector.
The total genetic composition of the chromosomes in the nucleus of a gamete.
www.pestmanagement.co.uk /lib/glossary/glossary_g.shtml   (2629 words)

  
 No20 Opinion on present organisation of gamete donation and its consequences. July 18, 1990
The authorities had accepted the principle that the practice of medically assisted reproduction (MAR), particularly when gamete donation is involved, must be controlled in both quality and quantity.
In April 1988, two decrees (n°s 88327 and 88328) initiated regulations for MAR activities which in terms of their biology are defined as " sperm collection, processing of human gametes in view of fertilisation, their conservation, in vitro fertilisation and the conservation of fertilised human eggs with a view to transfer".
It is worthy of note that no difference is made between intra-marital MAR activities and those using gametes foreign to the couple.
www.ccne-ethique.fr /english/avis/a_020.htm   (833 words)

  
 Reproductive semi-cloning respecting biparental embryo origin: Embryos from syngamy between a gamete and a haploidized ...
Embryos from syngamy between a gamete and a haploidized somatic cell
Thus, the co-existence of the gamete- and somatic cell-derived
a gamete and a pseudo-gamete derived from a haploidized somatic
humrep.oxfordjournals.org /cgi/content/full/17/8/1933   (3453 words)

  
 The Eggcorn Database » gamete
The moderately frequent misspelling GAMETE doesn’t double the M but does use the vowel E. However, it also has a final E, which is otherwise a rare feature of the misspellings; note that GAMMETE gets no hits.
I suggest that these facts indicate that writers recognize that GAMETE is the spelling for a word of English — the other misspellings are not standard spellings of English words — which is then available (despite its own oddities of spelling) for the idiom “run the _” ‘cover a complete range or extent’.
Probably even fewer people know the word “gamete” than the word “gamut”, but notice that if you misspell the latter as “gamet”, MS Word corrects it to “gamete”.
eggcorns.lascribe.net /english/572/gamete   (475 words)

  
 No18 Update on studies undertaken by the committee regarding gamete and embryo donation. December 15, 1989
There is a fundamental and obvious difference between tissue or organ donation, the principle of which is generally acceptable, and gamete or embryo donation.
Extracted from the body and subjected to principles and methods which govern instrumental techniques, gametes and embryos - the source of life which conditions the lengthy and hesitant psychic construction of the individual - may well be represented as property, belongings, objects to be used for the satisfaction of sometimes ambiguous yearnings.
At the same time, it is inevitable that for these forms of procreation, intermediaries, either individual or institutions, will be needed and that there may be reason to fear that decisions are not always solely the result of free will and disinterested reflection.
www.ccne-ethique.fr /english/avis/a_018.htm   (3681 words)

  
 Gamete Intrafallopian Transfer   (Site not responding. Last check: 2007-11-05)
When the marital act of sexual intercourse is not able to attain its procreative purpose, assistance that does not separate the unitive and procreative ends of the act, and does not substitute for the marital act itself, may be used to help married couples conceive.
Homologous artificial fertilization (that is, any technique used to achieve conception using the gametes of the two spouses joined in marriage) is prohibited when it separates procreation from the marital act in its unitive significance (e.g., any technique used to achieve extra-corporeal conception).
However, it is not simply the passage of time between coitus and the injection of the gametes which would seem to render GIFT immoral but the fact that the intrinsic link between coitus and new life is broken by the intervening human acts.
www.loras.edu /~CatholicHE/Arch/Sexuality/Gamete.html   (3955 words)

  
 Fertility Counseling and Gamete Cryopreservation Program (FCGCP) - UMCCC Clinics   (Site not responding. Last check: 2007-11-05)
Her research include clinical research in the use of saline infusion sonography in infertility patients, and the use of ultrasound in assisted reproductive technologies.
She recently presented her findings on novel means of sperm freezing at several international meetings including the annual meeting for the American Society for Reproductive Medicine.
She is a member of the leukemia steering committee, the non-Hodgkin's lymphoma and infant leukemia treatment protocols group, as well as the nursing committee and late effects study groups of the Children's Oncology Group - an international consortium of treatment centers dedicated to curing childhood cancer through clinical trials.
www.cancer.med.umich.edu /clinic/fertilitystaff.htm   (634 words)

  
 Understanding Probability
If we know the probability of each type of gamete from the probability of each alleleomorph, we can calculate the probability of each zygote genotype.
The probability that a male gamete contains a B allele does not influence the probability that a female gamete contains a B allele.
The probability of a male gamete with the B allele is independent of the probability of a female gamete with a B allele.
www.ndsu.nodak.edu /ndsu/abergstr/webcourses/genetics/up/up05.htm   (208 words)

  
 Gamete intra-Fallopian Transfer (GIFT) explained
It can only be used where a woman has at least one normal fallopian tube - this sometimes involved undergoing an initial assessment laparoscopy to view the tubes and ensure they were open.
The recovered eggs are then inspected, and the best two or three are mixed in a narrow catheter tube with a fresh sample of the male partner's sperm.
The catheter is then gently inserted via a laparoscope, into the outer ends of one or both fallopian tubes and the egg and sperm (gametes) are flushed into the woman's fallopian tubes so that fertilisation occurs inside the body.
www.ivillage.co.uk /health/whealth/repro/articles/0,,180663_622130,00.html   (364 words)

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