isogametes
similar gametes (sex cells)
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby ...
gametes Haploid reproductive cells (ovum and sperm). PICTURE
gametophyte The haploid stage of a plant exhibiting alternation of generations, generates gametes by the process of mitosis.
Gametes
Because pairs of chromosomes separate during meiosis I, gametes are haploid, that is, they carry only one copy of each chromosome. An Aa individual therefore produces two kinds of gametes: A and a.
gametes - reproductive cells; sperm and egg cells in animals.
gene - section of a chromosome which codes for a protein or RNA product.
Gametes from human ES cells?
Working with mice, several laboratories report that they have been able to coax ES cells to differentiate into cells with some of the properties of gametes, including ...
gametes
Haploid egg or sperm cells that unite during sexual reproduction to produce a diploid zygote.
Covered in BIOL1020 Lab 6 Mitosis & Meiosis ...
gametes Mature haploid cells (sperm and ova) that fuse to form a zygote.
gametic meiosis. Meiosis that occurs during formation of the gametes, as in humans and other metazoa.
Two gametes fuse to create a new sporophyte. This cycle is known as alternation of generations, but a better term is "biological life cycle", as there may be more than one phase and so it cannot be a direct alternation.
The gametes of a plant of genotype SsYy should have the genotypes:
A. Ss and Yy
B. SY and sy ...
Fusion of gametes formed by different individuals; as opposed to self-fertilization.
crossing over
The reciprocal exchange of genetic material between nonsister chromatids during synapsis of meiosis I.
noun, plural: gametes
(1) A reproductive cell or sex cell that contains the haploid set of chromosomes, e.g. spermatozoon or sperm cell (male reproductive cell) and egg cell or ovum (female reproductive cell).
The reduction division process by which haploid gametes and spores are formed, consisting of a single duplication of the genetic material followed by two mitotic divisions. Messenger RNA (mRNA).
Artificial insemination -- the placement of sperm into a female reproductive tract or the mixing of male and female gametes by other than natural means. Autosome -- a nuclear chromosome other than the X- and Y-chromosomes.
Asexual - a type of reproduction that does not require the union of female and male gametes
Biogenesis - the concept that all life arises from living matter
Cell - the smallest unit of life that carries out its own processes ...
The purpose of meiosis is to produce haploid (1n) gametes. Another purpose is to recombine genes from the parents of the individual in whom meiosis is occurring.
In vitro fertilization may take place with gametes from individuals other than the woman in whom the embryo may be implanted, or the male who is the prospective father. Whose authorization is necessary for collecting and analyzing DNA from the embryo?
Most animal cells except the gametes have a diploid set of chromosomes. The diploid human genome has 46 chromosomes. Compare haploid.
Dizygotic Two cells having been fertilised at the same time (often resulting in twins.) ...
They produce pollen, which contains the male gametes (sperm). The female parts of the flower are the stigma, style, and ovary. The egg (female gamete) is produced in the ovary.
Gametogenesis is the process of forming gametes (by definition haploid, n) from diploid cells of the germ line.
In a finite population (as all biological populations are) the gametes contributing to the next generation are a sample of the alleles in the gene pool.
All of the alleles available among the reproductive members of a population from which gametes can be drawn.
Related Terms:
Allele ...
This means that when somatic cells are produced from two gametes, one allele comes from the mother, one from the father. These alleles may be the same (true-breeding organisms, e.g. ww and rr in Fig. 3), or different (hybrids, e.g. wr in Fig. 3).
Meiosis results in four rather than two daughter cells (gametes), each with a haploid set of each chromosome pair. In meiosis I the prophase is more complex than that of mitosis.
Two successive nuclear divisions (with corresponding cell divisions) that produce haploid gametes (in animals) or haploid sexual spores (in plants and fungi) having one-half of the genetic material of the original cell.
Human diploid cells (those that are not gametes) characteristically exhibit 46 chromosomes, but this number can be as low as 2, as is the case for some ants and roundworms, or more than a thousand, ...
When it's all over, you are left with four haploid cells that are called gametes. The eventual purpose of the gametes will be to find other gametes with which they can combine. When they do, they will form a new organism.
In a reciprocal translocation heterozygote during meiosis the segregation of a translocated and a normal chromosome together, giving unbalanced gametes with duplications and deficiencies leading to non-viable zygotes.
Epidemic spawning. Simultaneous shedding of gametes by a large number of individuals
Epipelagic zone. The 0- to 150-m-depth zone, seaward of the shelf-slope break
Epiphyte. Microalgal organism living on a surface (e.g., on a seaweed frond) ...
Gamete: A mature reproductive cell that is capable of fusing with another gamete of the opposite sex to form a zygote. Male gametes are typically known as sperm and female gametes a typically known as eggs. See also fertilization, zygote.
syngamy -- The process of union of two gametes; sometimes called fertilization. It encompasses both plasmogamy and karyogamy.
- Mode of asexual production in which there is no fusion of gametes but the structure involved are commonly concerned in sexual reproduction.
Arabidopsis ...
So there has to be a way to take those paired chromosomes and break them apart in order to make gametes; sperm and eggs. That's what meiosis is all about.
Somatic cell A cell which is not on the lineage from which gametes are made. (see germline)
Somatic cell genetics The study of genes using hybrids (fusions) between the somatic cells of different species.
Gene flow: The exchange of genetic traits between populations by movement of individuals, gametes, or spores. It involves the spread of new variants among different populations through dispersal.
A full set of genetic material consisting of paired chromosomes, one from each parental set. Most animal cells except the gametes have a diploid set of chromosomes. The diploid human genome has 46 chromosomes.
See also: haploid ...
Fertilization: Fusion of female and male haploid gametes to form a diploid zygote from which a new individual develops.
Fetus: Final development stage before birth (following embryo).
Meiosis
The process of nuclear division associated with the formation of gametes or of haploid cells from a diploid.
[Gr. gamos - a marriage; Gr. genesis - origin, descent]. The formation of male and female sex cells or gametes (spermatozoa and ova, respectively) from germ cells.
Gametophyte in plants and algae‚ the 1n generation which produces gametes (eggs and sperm)
(gamet = marriage‚ reproduction; phyto = plant) ...
Gamete (1N): NUCLEAR ENVELOPES form and chromosomes disperse as CHROMATIN. Meiosis has produced 4 DAUGHTER CELLS, each with 1N chromosomes and 1N DNA. Later, in fertilization, male and female 1N gametes will fuse to form a 2N ZYGOTE.
pollen - in plants, the male germ cells produced in the anther. When ripe, pollen sacs at the end of the anthers split open to release the pollen. Each ripe pollen grain contains two male nuclei equivalent to male gametes. (Glossary of PM) ...
of years mutations and random genetic drift erode the Y chromosome, turning it into a genetic junkyard. In contrast, genes on the X are present in both males and females; X chromosomes, like autosomes, recombine in production of female gametes.
 See also: Gamete, Organ, Chromosome, Cells, Cell
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