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External fertilization is a mode of reproduction in which a male organism's sperm fertilizes a female organism's egg outside of the female's body. [1] It is contrasted with internal fertilization, in which sperm are introduced via insemination and then combine with an egg inside the body of a female organism.
This is an accepted version of this page This is the latest accepted revision, reviewed on 22 January 2025. Union of gametes of opposite sexes during the process of sexual reproduction to form a zygote This article is about fertilisation in animals and plants. For fertilisation in humans specifically, see Human fertilization. For soil improvement, see Fertilizer. "Conceive" redirects here. For ...
The biologist Thierry Lodé proposed (2001, 2012) five modes of reproduction based on the relationship between the zygote (fertilised egg) and the parents: [1] [2] Ovuliparity: fertilisation is external, the oocytes being released into the environment and fertilised outside the body by the male. [1]
Some stores including a Ralphs in El Segundo have posted signs explaining that the recent shortage of eggs is due to "the cost to source cage-free eggs," a result of California's Proposition 12 ...
First, external fertilization protects against paternity loss; however, sneaker tactics and strong sperm competition have evolved many times. Second, the earlier release of eggs than sperm gives females an opportunity to flee; however, in many paternal care species, eggs and sperm are released simultaneously.
Egg prices have steadily risen in recent months due to a spike in bird flu; outbreaks in egg-laying chickens are affecting the national supply, driving up costs.
With external fertilisation, eggs are often laid by the female in a male's territory. [72] [page needed] Male territoriality is particularly common with external fertilisation. Therefore, the male is most closely associated with the embryos. Males may defend their territories and thereby incidentally defend their eggs and young.
Nationally, a dozen large Grade A eggs cost $3.65 on average in November, compared to $3.37 in October and $2.52 at the start of 2024. However, there is good news for some egg producers, ...