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Fertilization in Biological Definition

Gamete

... or spores —are the specialized cells that come together during fertilization (conception) in organisms that reproduce sexually . In those species ... External link Gametogenesis (spermatogenesis, oogenesis) & fertilization ...

Infertility

... the woman being artificially inseminated with donor sperm. In vitro fertilization (IVF) in which eggs are removed from the woman, fertilized and then ... in one of the fallopian tubes, along with the man's sperm. This allows fertilization to take place inside the woman's body. Use of a surrogate mother ...

Parthenogenesis

... means the growth and development of an embryo or seed without fertilization by a male . Parthenogenesis occurs naturally in some lower plants ... may be due to the rare (perhaps only one mating out of a million) actual fertilization of eggs by a male, introducing new material to the gene pool. ...

Chromosome

... themselves ( crossover ), and thus create new chromosomes that are not inherited solely from either parent. When a male and a female gamete merge ( fertilization ), a new diploid organism is formed. Figure 3 : Karyogram of human female Karyotype To determine the (diploid) number of ...

Embryo

... from the eighth week of gestation . Stages : morula -> blastula -> gastrula . See also Embryogenesis Embryology In vitro fertilization Plant embryogenesis Embryo space colonization A chick embryo of thirty-three hours' incubation External link Chart ...

Human

... the individual begins at conception . An egg is usually fertilized inside the female by the male through sexual intercourse , though in vitro fertilization methods are also used. The developing individual is first called a zygote ; as it grows through successive stages inside the female's uterus over ...

Malaria

... malaria. Some merozoites turn into male and female gametocytes . If a mosquito bites the infected person and picks up gametocytes with the blood, fertilization occurs in the mosquito's gut, new sporozoites develop and travel to the mosquito's salivary gland, completing the cycle. Pregnant women are ...

Meiosis

... fetal life. Only just prior to ovulation meiosis I is resumed and is then completed at the time of ovulation (meiosis II ends only just after fertilization ). Oocytes that are not ovulated do not complete meiosis I. The end of Prophase I (also known as Prometaphase I ) is signified by contraction and ...

Neural tube

... produced in the notochord and basal plate . Neural tube defects Normally the closure of the neural tube occurs around the 30th day after fertilization . However, if something interferes and the tube fails to close properly, a neural tube defect will occur. Among the most common tube defects are ...

Sperm

... cells, composed normally of a head, basal body (or midpiece ), and tail . The head contains some cytoplasm and the nuclear material for fertilization . The basal body contains a large concentration of mitochondria that provide the energy for sperm motility through the production of ATP . The ...

Zygote

... A zygote ( Greek : ζυγωτόν ) is a cell that is the result of fertilization . That is, two haploid cells—usually (but not always) a sperm cell from a male and an ovum from a female —merge into a single ...
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