Fertilization

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.

Fertilization in which the two gametes are from the same individual. A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ...

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 Entrance of the sperm initiates a sequence of events: Meiosis II is completed. The cytoplasm of the egg rotates about 30 degrees relative to the poles.

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 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 (L. fertilis, capable of producing fruit) The union of two gametes from opposite sexes to form a zygote; it involves the fusion of nuclei of gametes (karyogamy) and the fusion of cytoplasm (plasmogamy).

fertilization -- The process by which an egg is made capable of generating offspring. It is often synonymous with syngamy. gamete -- Reproductive cells which fuse to form a zygote. Gametes are haploid, and may be differentiated into egg and sperm.

fertilization The union of haploid gametes to produce a diploid zygote. fetus ...

fertilization membrane A membrane that raises off the surface of an egg after sperm penetration; prevents multiple fertilization.

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: 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).

The fertilization usually occurs in the oviducts, but can happen in the uterus itself. The zygote then implants itself in the wall of the uterus, where it begins the processes of embryogenesis and morphogenesis. Full article ...

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: The mixing of eggs with sperm in a laboratory dish in order to achieve conception.

Crossing Fertilization of an organism from an other organism with a different genetic constitution. Cf. Selfing.

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.

Parthenogenesis -- the development of an individual from an egg without fertilization.

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 ...

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.

Usually, self-fertilization does not occur. Also called synchronous hermaphrodites. Examples: Earthworms.

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) ...

(partheno = virgin‚ without fertilization; genesis = origin‚ birth)    Louis Pasteur person who‚ in 1864‚ disproved spontaneous generation in microscopic organisms such as bacteria    Patella the kneecap (patell = a little dish) ...

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.

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.

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.

See also: Organ, Trans, Cells, Animal, Human