fertilization
union of sperm and egg in sexual reproduction
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby ...
fertilization
noun
1. (Science: cell biology) a process in sexual reproduction that involves the union of male (sperm) and female (ovum) gametes (each with a single, haploid set of chromosomes) to produce a diploid zygote.
Fertilization membrane
A membrane formed in some aquatic species from the vitelline membrane and cortical granules immediately after sperm penetration into the ovum. It is thought to prevent polyspermy by making the egg impenetrable to other sperm.
4. Fertilization of the Ovum
FIG. 8- The process of fertilization in the ovum of a mouse. (After Sobotta.) (See enlarged image) ...
A dramatic rise in intracellular calcium plays a vital role at the moment of fertilization, eliciting the resumption of meiosis and the initiation of embryo development.
fertilization The fusion of two gametes (sperm and ovum) to produce a zygote that develops into a new individual with a genetic heritage derived from both parents.
fertilization -- The process by which an egg is made capable of generating offspring. It is often synonymous with syngamy.
fiber -- Elongated and thickened cell found in xylem tissue. It strengthens and supports the surrounding cells.
Fertilization
If moisture is plentiful, the sperm swim to archegonia — usually on another prothallus because the two kinds of sex organs generally do not mature at the same time on a single prothallus.
Fertilization and dispersal
Main article: biological dispersal
In this picture you can clearly see the stamens of the flower ...
fertilization cone - a prominence extending from the surface of some eggs at the moment of, or in some cases allegedly shortly before contact with a sperm.
Fertilization: The joining or fusion of the male gamete (sperm) and the female gamete (egg) to form a zygote during sexual reproduction. See also gamete, zygote.
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).
self-fertilization
The union of egg and sperm produced by a single hermaphroditic organism.
self-pollination ...
double fertilization A characteristic of angiosperms in which a pollen tube carries two sperm cells to the female gametophyte in the ovule.
Fertilization normally occurs in the upper part of the Fallopian tubes. It takes about 6 days for the fertilized egg to move through the Fallopian tube and implant itself into the lining of the uterus where it will develop for 9 months.
Fertilization
The union of the male and female gametes; in plants pollination.
Related Terms:
Gamete
Mature male or female reproductive cell (sperm or ovum) with a haploid set of chromosomes (23 for humans).
Fertilization, the process in which gametes-a males sperm and a females egg or ovum-fuse together, ... The acrosome releases proteins that dissolve the ...
Full article ...
fertilization membrane A membrane that raises off the surface of an egg after sperm penetration; prevents multiple fertilization.
After fertilization, when the egg is still in the oviduct, it begins to divide by mitosis to form a hollow fluid filled ball of cells called the blastula. This process is called cleavage.
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?
Crossing
Fertilization of an organism from an other organism with a different genetic constitution. Cf. Selfing.
Related Terms:
Selfing
Self-fertilization of an organism. Cf. crossing.
Fertilization of a plant from a plant with a different genetic makeup. Crossing-over. The exchange of DNA sequences between chromatids of homologous chromosomes during meiosis. Culture. A particular kind of organism growing in a laboratory medium.
>fertilization that makes all the difference. The information and
>directions for a whole person are not present until that occurs.
>Otherwise, any other point at which we say "Life" has occurred is
really ...
Parthenogenesis -- the development of an individual from an egg without fertilization.
They result from the fertilization of a single egg with a single sperm. And as those cells divide and multiply, at some point very early in embryonic growth they split into two individuals.
When the sperm attaches to the egg during fertilization, the tail falls off. Consequently, the only mitochondria the new organism usually gets are from the egg its mother provided.
Cross-pollination. Fertilization of a plant from a plant with a different genetic makeup.
Crossing-over. The exchange of DNA sequences between chromatids of homologous chromosomes during meiosis.
parthenocarpy. Development of fruit without fertilization and seed.
parthenogenesis. Development of an egg without fertilization.
pathogen. A disease-causing organism.
Siblings born at the same time as the result of fertilization of two ova by two sperm. They share the same genetic relationship to each other as any other siblings.
See also: identical twin
Full gene sequence ...
Parthenogenesis: Development of an insect, from egg to adult, without fertilization.
Pathogen: A disease-causing organism.
Pest: An organism that interferes with human activities, property, or health, or is objectionable.
This is due to nondisjunction that occurs during mitosis (after fertilization).
Mosaic Down Syndrome is likely to be less severe because some of the cells are normal.
Trisomy 18 (Edward Syndrome) ...
Sperm are some of the most active cells in the body, their motility responsible for getting them to the site of an ovum for fertilization.
Asexual Reproduction
Sexual Reproduction
Sexual Reproduction: Fertilization
Sex Chromosome Abnormalities ...
open pollinated SF A method of seed generation in which natural self-fertilization is allowed to take place. Both the pollen donor and egg donor are from the plant.
parthenogenesis - a method of reproduction that does not require mating or fertilization. May be obligatory or facultative and may result in all female offspring, all male offspring or a mixture depending on the species.
change in mammalian sperm that occurs after exposure to female genital tract making the sperm competent to undergo the acrosome reaction; this change is necessary for penetration of the cumulus matrix and for fertilization.
They noticed that when they crossed individuals from different species, only males were produced. In other words, fertilization was not occuring.
endosperm
A nutrient-rich tissue formed by union of a sperm cell with two polar nuclei during double fertilization, which provides nourishment to the developing embryo in angiosperm seeds.
Eggs: We're not talking about eggs like a chicken egg, but reptile eggs are tough enough to survive on land. Amphibians needed moist areas for their eggs to develop and for fertilization to occur.
Recombination occurs naturally in plants and animals during the production of sex cells (sperm, eggs, pollen) and their subsequent joining in fertilization. In microbes, genetic material is recombined naturally during conjugation.
Parthenogenesis the ability of an unfertilized egg to develop and hatch
(partheno = virgin‚ without fertilization; genesis = origin‚ birth) ...
 See also: Organ, Cells, Human, Sperm, Animal
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