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gametes at Biology News

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

...ay have the ability to develop into PGCs and early gametes as has been shown previously for mouse embryonic s... them to grow into gametes. "Producing functional gametes is much more difficult, because we have to recreate for the cultured cells the environment of the de...

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

...nown 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 from the Institute of Human Genetics at the University of Goettingen in Goettingen, Germany and colleagu...

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

...then halved on the way to the production of mature gametes or spores. Near the end of the process, the materi...s. This is critical ?if the single-stranded DNA in gametes breaks, it can fall apart and possibly reassemble itself in devastating translocations." She notes ...

Multiple malaria infection inhibits spread of parasite

...ple 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 sporozoite can be transmitted with the saliva to a person if he/she is bitten by this mosquito. There the para...
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Nondisjunction

...ing 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 occur in the meiosis I or meiosis II phases of cellular reproduction. This is a cause of several...

Meiosis

...rmally diploid, and use meiosis to produce sexual gametes , which fuse to form zygotes that develop into n... meiosis If meiosis did not occur, fusion of the gametes would not result in a diploid condition (2n) but 4n. Meiosis also provides opportunities for new co...

Ploidy

...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 cells ( sperm and ovum ). Diploid Diploid cells (meaning double in Greek ) have two copies ( ho...

Gamete

...ts is called a pollen grain . Organs that produce gametes are called gonads in animals , and archegonia ...l number varies from species to species). When two gametes unite (typically in animals, involving a sperm and an egg), they form a zygote —a cell havi...

Ewens's sampling formula

...ions (specified below), if a random sample of n gametes is taken from a population and classified accordi...f after the sample of n is taken, m of the n gametes are chosen without replacement, then the resulting probability distribution on the set of all partit...

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gametes at Biology Dictionary

Zygote

...gote Mostly diploid cell formed by union of two gametes or reproductive cells . Ovum (female gamete )...] The diploid product of the union of haploid gametes in conception; a fertilized egg . Full article >>> zygote -- The product of game...

Zygospore

zygospore spore formed by the union of two gametes (male and female sex cells ) Source: Noland, Geo... spore that is formed from the union of similar gametes . Covered in Lab 6 Diversity of Microorganisms: Unicellular and Filamentous Eukaryotes ... Full...

X chromosome

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

Viability

...ration; express ed as a reduced number of viable gametes and hence reduced fertility. Non viability of a proportion of gametes or zygote s. Full article >>> It can be seen as the extent to which an individual s...

Tracheophyte

...mon. The haploid gametophyte produces haploid gametes in multicellular gametangia. Full article >>> vascular plants ( tracheophyte s ) seedless vascular plants Lycopodiophyta - clubmosses Equisetophyta - horsetails Pteridophyta - "true" ferns Psilotophyta - whisk ferns Ophioglo...

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Erythrocyte

...ome parasites differentiate into male and female gametes although these cannot be distinguished at the light microscope level. Full article >>> Red blood cells ( Erythrocyte s) Cells in the blood that de liver oxygen to tissue s and take carbon dioxide from them. Red blood count ...
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