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Gametes in Medical News

Nitrous gases and zinc in the crosshairs

... or not a particular substance causes cancer, has a mutagenic effect on gametes or poses a risk to unborn children during pregnancy. Analyses of the ... to the new MAK and BAT Values List, chromium (VI) compounds damage gametes and cause skin sensitivity. They received an "H" warning, which means that ...

Penn researchers identify first sex chromosome gene involved in meiosis and male infertility

... the X chromosome. Meiosis is the process of cell division that produces gametes in both sexes. During meiosis, homologous chromosomes undergo pairing, ... between paternal and maternal genomes to produce genetically diverse gametes (sperm or eggs). Therefore, defects in meiosis are a leading cause of ...

Human sperm created from embryonic stem cells

... and post meiotic germ cells (spermatids and sperm). These results indicated maturation of the primordial germ cells to haploid male gametes called IVD sperm - characterised by containing half a chromosome set (23 chromosomes). ...

Octuplets Fiasco Could Have Been Prevented

... the highest quality embryos can be selected for transfer. Special environmental conditions, advanced culture media, and delicate handling of gametes and embryos are required; these efforts result in better embryos, with higher implantation and pregnancy rates. Growing these embryos to day 5, the ...

Researchers block transmission of malaria in animal tests

... complex life cycle The malaria parasite has an extremely complicated lifecycle, which starts with the fertilisation of the parasites male and female gametes and the formation of an oocyst, in the mosquito's stomach wall. The oocyst further de-velops into sporozoittes, which travel up the mosquito's ...
Gametes in Medical Dictionary

Erythrocyte

... Sporozoites enter erythrocyte s and undergo asexual reproduction (budding). In the blood , some parasites differentiate into male and female gametes although these cannot be distinguished at the light microscope level. Red blood cells ( Erythrocyte s) Cells in the blood that de liver ...
Gametes in Biological News

Bitter-tasting nectar and floral odors optimize outcrossing for plants

... in German . Animals "personally" bring their gametes together seeking out sexual partners, mating, ... plants to optimize their ability to exchange gametes with each other. In a paper published in the ... optimize the tobacco plant's ability to exchange gametes and produce outcrossed seeds. Prior to these ...

Scripps scientists help decode mysterious green glow of the sea

... mucuswhich often draws the attention of human seafarersbefore releasing gametes into the water. The bright glow attracts male fireworms, which also release gametes into the bright green cloud. The precisely timed bioluminescent ...

Scientists demonstrate feasibility of preventing malaria parasite from becoming sexually mature

... complex, and it is not yet known what triggers the production of parasite gametes or sex cells. These sexual forms of the parasite do not contribute to ... parasite enzyme that is instrumental in triggering the emergence of mature gametes within the mosquito. Their findings are published today in the journal ...

Smithsonian scientists working to save microscopic threatened species

... create a genome resource bank, which will help preserve the genetic diversity of coral. Hagedorn, Henley and the team captured spawning coral gametes in nets during night dives and transferred them back to their laboratory on the beach for research and artificial inseminationoften working until 3 ....

Human embryonic stem cells have the potential to develop into eggs and sperm in the laboratory

... have the ability to develop into PGCs and early gametes as has been shown previously for mouse embryonic ... to grow into gametes. "Producing functional gametes is much more difficult, because we have to ... as fertilisation would involve only one set of gametes produced in this way and therefore a unique ...

Single molecular 'mark' seen as pivotal for genome compaction in spores and sperm

... has been duplicated and then halved on the way to the production of mature gametes or spores. Near the end of the process, the material ?called chromatin, ... to damage of all kinds. This is critical ?if the single-stranded DNA in gametes breaks, it can fall apart and possibly reassemble itself in devastating ...

Multiple malaria infection inhibits spread of parasite

... spread. The gametocyte is the developmental stage of the parasite that can be transmitted from people to the mosquito. In the mosquito's stomach the gametes are released and fertilisation takes place. The parasite develops further until the final stage (the sporozoite) in the salivary gland. The ...

Sperm created in the laboratory from embryonic stem cells produce viable progeny

... into primordial germ cells that then give rise to cells resembling mature egg and sperm cells, known as gametes. However, the functionality of the gametes has not been thoroughly tested and many questions about the viability of these cells remain unanswered. Dr. Karim Nayernia and Dr. Wolfgang Engel ...
Gametes in Biological Definition

Gamete

... gametes (in Greek : ... is called a pollen grain . Organs that produce gametes are called gonads in animals , and archegonia or antheridia in plants . gametes are haploid cells; that is, they contain one ...

Chromosome

... the father) or polyploid [Xn] (more than two sets of chromosomes), and gametes (reproductive cells) which are haploid [n] (they have only one set of chromosomes). gametes are produced by meiosis of a diploid germ line cell. During meiosis, ...

Ewens's sampling formula

... under certain conditions (specified below), if a random sample of n gametes is taken from a population and classified according to the gene at a ... the property that if after the sample of n is taken, m of the n gametes are chosen without replacement, then the resulting probability ...

Meiosis

... and plants are normally diploid, and use meiosis to produce sexual gametes , which fuse to form zygotes that develop into new organisms. In most ... Significance of meiosis If meiosis did not occur, fusion of the gametes would not result in a diploid condition (2n) but 4n. Meiosis also ...

Bacterial conjugation

... regarded as the bacterial equivalent of sexual reproduction or mating ; however it is not actually sexual as it does not involve the fusing of gametes and the creation of a zygote , it is merely the exchange of genetic information. In order to perform conjugation, one of the bacteria has to carry ...

Cell division

... of the cell, called cytokinesis . A diploid cell may also undergo meiosis to produce haploid cells, usually four. Haploid cells serve as gametes in multicellular organisms, fusing to form new diploid cells. Multicellular organisms replace worn-out cells through cell division. However, in ...

Cell growth

... as the parental cell. Meiosis is used for a special cell reproduction process of diploid organisms. It produces four special daughter cells ( gametes ) which have half the normal cellular amount of DNA. A male and a female gamete can then combine to produce a zygote , a cell which again has ...

Ploidy

... organisms produce haploid sex cells that can combine to form a diploid zygote , for example animals are primarily diploid but produce haploid gametes . During meiosis , germ cell precursors have their number of chromosomes halved by randomly "choosing" one homologue, resulting in haploid germ ...

Ploidy

... organisms produce haploid sex cells that can combine to form a diploid zygote , for example animals are primarily diploid but produce haploid gametes . During meiosis , germ cell precursors have their number of chromosomes halved by randomly "choosing" one homologue, resulting in haploid germ ...

Nondisjunction

... In biology , nondisjunction is the failure of a chromosome to split correctly during meiosis . This results in the production of gametes which have either more or less of the usual amount of genetic material, and is a common mechanism for trisomy or monosomy . Nondisjunction can ...

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Gametes in Biological Dictionary

Syngamy

... and syngamy . ... Meiosis and Syngamy | gametes | Evolution of Life Cycles ... Sexual ... ovule. ... syngamy n. The fusion of two gametes in fertilization. syngamic syngam ' ic or syn ' ... , ... syngamy The union of nuclei of two gametes to produce a zygote nucleus, ... ...

Haploid gametophyte

... plant of the gametophyte generation produces gametes by mitosis. ... Gametophyte – haploid ... - a haploid plant which produces gametes ... Haploid cells undergo mitosis to ... plant of the gametophyte generation produces gametes by mitosis. ... Haploid cells undergo ...

Haploid

... at Dictionary.com a ... haploid cells. ... the gametes (reproductive cells) are haploid . Compare ... Haploid from Biology-Online.org dictionary. ... gametes being haploid are essential particularly during ... haploid ... In most animals, only the gametes (reproductive cells) are haploid . ... ... ...

Gametes

... produce two morphologically distinct types of gametes , and in which each ... ... and differentiation to form mature haploid gametes . Depending on the biological life cycle of the ... Dictionary.com a free online dictionary with ... gametes may be identical in form (isogamy), as in the ...

Gamete

... (one set of chromosomes), that ... These gametes that are fusing may be of similar size (isogamy) ... Microgamete, Nullisomic gamete . ... gametes (in Greek: γα&amp ... of the sets of ... In most organisms the gametes are produced by a special double cell ...

Somatic cells

... ... The term somatic refers to cells of the body, rather than gametes (eggs or sperm). In humans, somatic cells contain two copies of each chromosome (diploid), whereas gametes only contain one copy of each chromosome (haploid). Although all ...

Somatic

... The term somatic refers to cells of the body, rather than gametes (eggs or sperm). In humans, somatic cells contain two copies of each chromosome (diploid), whereas gametes only contain one copy of each chromosome (haploid). Although all ...

Sex cells

... of any resulting zygote, as the genotype of the sex -determining ... gametes are haploid cells ; that is, they contain half(n) of a complete set of ... die, ... Meiosis, a type of cell division, results in production of gametes (eggs & sperm). Genetically unique sex cells combine at ...

Pollination

... and sexual reproduction. Pollen grains, which contain the male gametes (sperm) to where the female gamete(s) are ... pollination ( ... ... Why is pollination necessary ? The pollen contains the male gametes (sperm) ... If you want to understand why pollination is such a ...

Microgametophyte

... a microgametophyte (male gametophyte), which ultimately produces male gametes (sperm), and ... microgametophyte synonyms, microgametophyte ... Flora of ... vegetative growth of the microspore, that produces the male gametes of a ... The development of the microgametophyte (male gametophyte) ...

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