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Superfecundation
Superfecundation is the fertilization of two or more ova from the same menstrual cycle by sperm from the same or different males, whether through separate acts of intercourse or during a single sexual encounter with multiple males (e.g. double penetration). This can potentially result in twin babies that have different biological fathers. The term superfecundation is derived from fecund, meaning able to produce offspring. Homopaternal superfecundation is a form of twinning where fertilization of two separate ova occurs as a result of two or more distinct instances of intercourse or insemination with the same male partner or donor, leading to fraternal twins. Heteropaternal superfecundation, on the other hand, is an atypical form of twinning that results in twins that are genetically half siblings – sharing the same biological mother, but with different biological fathers. Conception Sperm cells can live inside a human female's body for up to five days, and once ovulation occu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polyandry In Nature
In behavioral ecology, polyandry is a class of mating system where one female mates with several males in a breeding season. Polyandry is often compared to the polygyny system based on the cost and benefits incurred by members of each sex. Polygyny in nature, Polygyny is where one male mates with several females in a breeding season (e.g., lions, deer, some primates, and many systems where there is an Alpha (biology), alpha male). A common example of polyandrous mating can be found in the field cricket (''Gryllus bimaculatus'') of the insect order Orthoptera (containing crickets, grasshoppers, and groundhoppers). Polyandrous behavior is also prominent in many other insect species, including honeybees, the red flour beetle, the Callosobruchus chinensis, adzuki bean weevil, and the species of spider ''Stegodyphus lineatus''. Polyandry also occurs in some mammals including primates such as marmosets and the marsupial genera ''Antechinus'' and bandicoots, and in around 1% of all bird ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Twin
Twins are two offspring produced by the same pregnancy.MedicineNet > Definition of Twin Last Editorial Review: 19 June 2000 Twins can be either ''monozygotic'' ('identical'), meaning that they develop from one zygote, which splits and forms two embryos, or ''dizygotic'' ('non-identical' or 'fraternal'), meaning that each twin develops from a separate egg and each egg is fertilized by its own sperm cell. Since identical twins develop from one zygote, they will share the same sex, while fraternal twins may or may not. In very rare cases, fraternal or (semi-) identical twins can have the same mother and different fathers ( heteropaternal superfecundation). In contrast, a fetus that develops alone in the womb (the much more common case in humans) is called a ''singleton'', and the general term for one offspring of a multiple birth is a ''multiple''. Unrelated look-alikes whose resemblance parallels that of twins are referred to as doppelgänger. Statistics The human twin birth ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Castor And Pollux
Castor and Pollux (or Polydeuces) are twin half-brothers in Greek and Roman mythology, known together as the Dioscuri or Dioskouroi. Their mother was Leda, but they had different fathers; Castor was the mortal son of Tyndareus, the king of Sparta, while Pollux was the divine son of Zeus, who seduced Leda in the guise of a swan. The pair are thus an example of heteropaternal superfecundation. Though accounts of their birth are varied, they are sometimes said to have been born from an egg, along with their twin sisters Helen of Troy and Clytemnestra. In Latin, the twins are also known as the Gemini ("twins") or Castores, as well as the Tyndaridae or Tyndarids. Pollux asked Zeus to let him share his own immortality with his twin to keep them together, and they were transformed into the constellation Gemini. The pair were regarded as the patrons of sailors, to whom they appeared as St. Elmo's fire. They were also associated with horsemanship, in keeping with their origin as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mixed Twins
Mixed twins are fraternal or non-identical twins born to multiracial families which differ in skin color and other traits considered to be racial features. From a biological point of view, the differences in these fraternal or dizygotic twins from two biracial parents are not surprising. In humans, a relatively small number of genes are thought to be responsible for human skin color. Different alleles or gene variants code for differences in the melanin found within the skin. Within some groups are high frequencies of dark skin alleles, while others have high frequencies of light skin alleles, for example. The parents of such twins, who are typically both of mixed race, have a combination of alleles for light and dark skin in their genome. Each sperm or egg cell possesses a random selection of genes from its mother or father. While not the most probable event, a sperm or egg may randomly acquire, for example, mostly alleles that confer light skin coloration or mostly alleles tha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chimera (genetics)
A genetic chimerism or chimera ( or ) is a single organism composed of cells of different genotype, genotypes. Animal chimeras can be produced by the fusion of two (or more) embryos. In plants and some animal chimeras, Mosaic (genetics), mosaicism involves distinct types of tissue that originated from the same zygote but differ due to mutation during ordinary cell division. Normally, genetic chimerism is not visible on casual inspection; however, it has been detected in the course of proving parentage. More practically, in agronomy, "chimera" indicates a plant or portion of a plant whose tissues are made up of two or more types of cells with different genetic makeup; it can derive from a bud mutation or, more rarely, at the grafting point, from the concrescence of cells of the two bionts; in this case it is commonly referred to as a "graft hybrid", although it is not a hybrid in the genetic sense of "hybrid". In contrast, an individual where each cell contains genetic materi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Philammon
In Greek mythology, Philammon (Ancient Greek: Φιλάμμων) was an excellent musician, a talent he received from his father Apollo. Family Philammon's mother was either Chione (Greek myth), Chione (or Philonis), daughter of Daedalion, or Leuconoe, daughter of Phosphorus (morning star), Eosphoros, or Chrysothemis (daughter of Carmanor), Chrysothemis, daughter of Carmanor (of Crete), Carmanor of Crete. By Argiope (mythology), Argiope, a nymph of Mount Parnassos, he had Thamyris. Mythology Philammon was unnaturally beautiful and thus, one of the nymphs (Argiope) seduced the youth and became pregnant. But Philammon refused to take her into his house as his wife and for being ashamed of the pregnancy, the girl left the Peloponnese and came to the Akte (shore) where she gave birth to a boy, Thamyris. Philammon was said to have established the tradition of the hymns celebrating the births of Artemis and Apollo, written by himself, being performed by choruses of girls at Delphi. He ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Autolycus
In Greek mythology, Autolycus (; ) was a robber who had the power to metamorphose or make invisible the things he stole. He had his residence on Mount Parnassus and was renowned among men for his cunning and oaths. Family There are a number of different accounts of the birth of Autolycus. According to most, he was the son of Hermes and Chione Hyginus, ''Fabulae'201/ref> or Philonis. In Ovid's version, Autolycus was conceived after Hermes had intercourse with the virgin Chione. Pausanias instead states that Autolycus' real father was Daedalion. Pausanias8.4.6/ref> In some accounts, his mother was also called Telauge. Depending on the source, Autolycus was the husband of Mestra (who could change her shape at will and was a daughter of Erysichthon), or of Neaera, or of Amphithea. He became the father of Anticlea (who married Laertes of Ithaca and was the mother of OdysseusHomer, ''Odyssey'24.334/ref>) and several sons, of whom only Aesimus, father of Sinon was named. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hermes
Hermes (; ) is an Olympian deity in ancient Greek religion and mythology considered the herald of the gods. He is also widely considered the protector of human heralds, travelers, thieves, merchants, and orators. He is able to move quickly and freely between the worlds of the mortal and the divine aided by his winged sandals. Hermes plays the role of the psychopomp or "soul guide"—a conductor of souls into the afterlife. In myth, Hermes functions as the emissary and messenger of the gods, and is often presented as the son of Zeus and Maia, the Pleiad. He is regarded as "the divine trickster", about which the '' Homeric Hymn to Hermes'' offers the most well-known account. Hermes's attributes and symbols include the herma, the rooster, the tortoise, satchel or pouch, talaria (winged sandals), and winged helmet or simple petasos, as well as the palm tree, goat, the number four, several kinds of fish, and incense. However, his main symbol is the ''caduceus'', a wi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Apollo
Apollo is one of the Twelve Olympians, Olympian deities in Ancient Greek religion, ancient Greek and Ancient Roman religion, Roman religion and Greek mythology, Greek and Roman mythology. Apollo has been recognized as a god of archery, music and dance, truth and prophecy, healing and diseases, the Sun and light, poetry, and more. One of the most important and complex of the Greek gods, he is the son of Zeus and Leto, and the twin brother of Artemis, goddess of the hunt. He is considered to be the most beautiful god and is represented as the ideal of the ''kouros'' (ephebe, or a beardless, athletic youth). Apollo is known in Greek-influenced Etruscan mythology as ''Apulu''. As the patron deity of Delphi (''Apollo Pythios''), Apollo is an oracular god—the prophetic deity of the Pythia, Delphic Oracle and also the deity of ritual purification. His oracles were often consulted for guidance in various matters. He was in general seen as the god who affords help and wards off e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Daedalion
In Greek mythology, Daedalion or Daidalion () was a son of Hesperos, the god of the Evening Star or Phosphorus, god of the Morning Star and the brother of Ceyx. Ceyx describes his brother Daedalion as a great warrior, full of courage and vigour but acknowledged that he could also be harsh, relishing the cruelty of war. The story of Daedalion's life is told mainly in Ovid's ''Metamorphoses'' though passing references can be found in other classical works. It is possible the story may have originated with Boios. In the tale Daedalion, grief-stricken following the death of his daughter Chione, attempts to cast himself off Mount Parnassus only to be transformed into a hawk by Apollo. Mythology Beautiful daughter Daedalion's daughter Chione was said to be so beautiful that she was the object of a thousand men's desire the moment she turned fourteen. As it transpired, Chione's admirers were not limited to mortal men. Whilst returning from visits to earth, both Apollo and Her ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heracles
Heracles ( ; ), born Alcaeus (, ''Alkaios'') or Alcides (, ''Alkeidēs''), was a Divinity, divine hero in Greek mythology, the son of ZeusApollodorus1.9.16/ref> and Alcmene, and the foster son of Amphitryon.By his adoptive descent through Amphitryon, Heracles receives the epithet Alcides, as "of the line of Alcaeus (mythology), Alcaeus", father of Amphitryon. Amphitryon's own, mortal son was Iphicles. He was a descendant and half-brother (as they are both sired by the god Zeus) of Perseus. He was the greatest of the Greek heroes, the ancestor of royal clans who claimed to be Heracleidae (), and a champion of the Twelve Olympians, Olympian order against chthonic monsters. In Roman mythology, Rome and the modernity, modern western world, West, he is known as Hercules, with whom the later Roman emperors, in particular Commodus and Maximian, often identified themselves. Details of his cult (religion), cult were adapted to Rome as well. Origin Many popular stories were told ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
