Union of an egg and sperm to form a zygote within the female body
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Internal fertilization is the union of an egg and sperm cell during sexual reproduction inside the female body. Internal fertilization, unlike its counterpart, external fertilization, brings more control to the female with reproduction.[1] For internal fertilization to happen there needs to be a method for the male to introduce the sperm into the female's reproductive tract.
Most taxa that reproduce by internal fertilization are gonochoric.[2]: 124–125 In mammals, reptiles, and certain other groups of animals, this is done by copulation, an intromittent organ being introduced into the vagina or cloaca.[3][4] In most birds, the cloacal kiss is used, the two animals pressing their cloacas together while transferring sperm.[5] Salamanders, spiders, some insects and some molluscs undertake internal fertilization by transferring a spermatophore, a bundle of sperm, from the male to the female. Following fertilization, the embryos are laid as eggs in oviparous organisms, or continue to develop inside the reproductive tract of the mother to be born later as live young in viviparous organisms.
undertake internalfertilization by transferring a spermatophore, a bundle of sperm, from the male to the female. Following fertilization, the embryos...
Among vertebrates, external fertilization is most common in amphibians and fish. Invertebrates utilizing external fertilization are mostly benthic, sessile...
reproduction and development are varied; all terrestrial species use internalfertilization, but this is sometimes by indirect transfer of the sperm via an...
(gámos) 'marriage') is a haploid cell that fuses with another haploid cell during fertilization in organisms that reproduce sexually. Gametes are an organism's reproductive...
Human reproduction is sexual reproduction that results in human fertilization to produce a human offspring. It typically involves sexual intercourse between...
cervix into the uterus or fallopian tubes for fertilization of the ovum. Upon successful fertilization and implantation, gestation of the fetus then occurs...
because an egg is fertilized inside the body, this is in contrast with in vitro fertilisation (IVF). In plants, the fertilization process is referred...
Fertilisation or fertilization (see spelling differences), also known as generative fertilisation, syngamy and impregnation, is the fusion of gametes...
animals for insemination and subsequent internalfertilization. Mating may also lead to external fertilization, as seen in amphibians, fishes and plants...
the only other frog genera that have internalfertilization. Limnonectes larvaepartus also has internalfertilization. The family Bufonidae contains over...
lordosis reflex is uninhibited. The female is ready for copulation and fertilization. When a male mammal mounts the female, tactile stimuli on the flanks...
fallopian tubes for fertilization of the ovum. Only one sperm is required to fertilize the ovum. Upon successful fertilization, the fertilized ovum, or zygote...
evolves, males and females typically differ in various aspects. Internalfertilization may have originated from oogamy, although some studies suggest [citation...
makes up about 90% of all species, fertilization is internal. As a general rule, salamanders with internalfertilization have indirect sperm transfer, but...
members of Homostiidae, and Heterosteus. Extraordinary evidence of internalfertilization in a placoderm was afforded by the discovery in the Gogo Formation...
which to release the gametes was achieved through the transition to internalfertilization. Among amniotes, the development of an erectile penis occurred independently...
the species, spermatozoa can fertilize ova externally or internally. In external fertilization, the spermatozoa fertilize the ova directly, outside of...
kingdom, the male intromittent organ is a hallmark characteristic of internalfertilization. Male cephalopods have a specialized arm, the hectocotylus, which...
These are the only North American frog species that reproduce by internalfertilization. They are among the most primitive known families of frogs. Its...
parents: Ovuliparity: Fertilization of eggs is external; zygotes develop externally. Oviparity: Fertilization of eggs is internal; zygotes develop externally...
in the epidermis – under control of the prohormone ecdysone, and internalfertilization. The group was initially contested by a significant minority of...
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