gametes

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...

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...

Chromosome

...id [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, the matching chromosomes of father and mother can exchange small parts of themselv...

Cell growth

...ganisms. 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 the normal amount of chromosomes. For details see the individual articles on DNA replication , binar...

Cell division

...id 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 some animals, cell division eventually halts, and the cell is then referred to as senescent . Senesce...

Bacterial conjugation

...ually 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 an F- plasmid , the other one must not. The F-plasmid (also called F-factor) is an episome (a pl...