Twin - Revision history

Prab at 13:41, 22 March 2025

2025-03-22T13:41:07Z

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-== Twin ==
+[[File:Mauch_Twins.jpg|Mauch twins|thumb]]
+[[File:Red-haired_Siblings.jpg|Red-haired siblings|left|thumb]]
 A '''twin''' is one of two offspring produced in the same pregnancy. Twins can be either [[monozygotic]] ("identical"), meaning that they develop from one [[zygote]], which splits and forms two embryos, or [[dizygotic]] ("fraternal"), meaning that each twin develops from a separate egg and each egg is fertilized by its own sperm cell.
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 == Notable Twins ==
 Some famous twins include the [[Bunker brothers]], Chang and Eng, who were conjoined twins from Siam (now Thailand) and became famous in the 19th century. In modern times, [[Mark and Scott Kelly]] are notable identical twins who have both served as astronauts.
 == Gallery ==
 <gallery>
 File:Dichorionic_twins_with_heart_activity_at_8w5d_since_co-incubation.gif|Dichorionic twins
 File:Monoamniotic_twins_at_15_weeks.jpg|Monoamniotic twins
@@ Line 49: / Line 37: @@
 File:Hereford_twins.jpg|Hereford twins
 </gallery>
 == Related Pages ==
 * [[Multiple birth]]
@@ Line 98: / Line 42: @@
 * [[Genetics]]
 * [[Fertility treatment]]
 {{Human reproduction}}
 [[Category:Twins]]
 [[Category:Human development]]

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2025-02-19T00:36:22Z

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← Older revision		Revision as of 00:36, 19 February 2025
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	File:Tweeling_transfusiesyndroom.jpg\|Twin		File:Tweeling_transfusiesyndroom.jpg\|Twin
	</gallery>		</gallery>
			== Twin ==

			A '''twin''' is one of two offspring produced in the same pregnancy. Twins can be either [[monozygotic]] ("identical"), meaning that they develop from one [[zygote]] that splits and forms two embryos, or [[dizygotic]] ("fraternal"), meaning that they develop from two different eggs fertilized by two different sperm cells.

			== Types of Twins ==

			=== Monozygotic Twins ===
			Monozygotic twins, also known as identical twins, occur when a single fertilized egg splits and develops into two embryos. These twins share the same [[genetic]] material and are always of the same [[sex]]. They are genetically identical, although environmental factors can lead to differences in appearance and personality.

			=== Dizygotic Twins ===
			Dizygotic twins, or fraternal twins, result from the fertilization of two separate eggs by two separate sperm cells. These twins are genetically similar to regular siblings, sharing about 50% of their DNA. They can be of the same or different sexes.

			=== Other Types ===
			There are other, less common types of twins, such as [[conjoined twins]], who are physically connected to each other, and [[semi-identical twins]], which occur when two sperm fertilize a single egg that then splits.

			== Causes of Twinning ==

			The occurrence of twins can be influenced by several factors, including genetics, maternal age, and fertility treatments. Dizygotic twinning is more common in certain families and ethnic groups, suggesting a genetic component. Older mothers and those who use fertility treatments are also more likely to have twins.

			== Development and Birth ==

			Twins can be delivered vaginally or via [[cesarean section]], depending on their position and health. Twin pregnancies are often monitored more closely due to the increased risk of complications such as [[preterm birth]], [[low birth weight]], and [[twin-to-twin transfusion syndrome]].

			== Twin Studies ==

			Twin studies are a valuable tool in [[genetics]] and [[psychology]] for understanding the influence of [[heredity]] and [[environment]] on human traits. By comparing monozygotic and dizygotic twins, researchers can estimate the heritability of traits and the impact of environmental factors.

			== Related Pages ==
			* [[Multiple birth]]
			* [[Conjoined twins]]
			* [[Genetics]]
			* [[Fertility treatment]]

			{{Human reproduction}}
			{{Twins}}

			[[Category:Twins]]
			[[Category:Human development]]

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2025-02-18T12:24:06Z

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← Older revision		Revision as of 12:24, 18 February 2025
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	[[Category:Twin studies]]		[[Category:Twin studies]]
	[[Category:Human development]]		[[Category:Human development]]
			<gallery>
			File:Mauch_Twins.jpg\|Twin
			File:Red-haired_Siblings.jpg\|Twin
			File:Fraternal_twin_brothers.jpg\|Twin
			File:Mirjam_Weichselbraun_and_Melanie_Binder,_ROMY_2009.jpg\|Twin
			File:Identical-fraternal-sperm-egg.svg\|Twin
			File:Mark_and_Scott_Kelly_at_the_Johnson_Space_Center,_Houston_Texas.jpg\|Twin
			File:Placentation.svg\|Twin
			File:Dichorionic_twins_with_heart_activity_at_8w5d_since_co-incubation.gif\|Twin
			File:Monoamniotic_twins_at_15_weeks.jpg\|Twin
			File:The_Childrens_Museum_of_Indianapolis_-_Female_ere_ibeji_twin_figure_pair.jpg\|Twin
			File:Chang-eng-bunker-PD.png\|Twin
			File:Tweeling_transfusiesyndroom.jpg\|Twin
			</gallery>

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2025-02-10T00:36:18Z

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← Older revision		Revision as of 00:36, 10 February 2025
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	~~'''~~Twin~~'''~~		== Twin ==

	A '''twin''' is one of two offspring produced in the same pregnancy. Twins can be either monozygotic (''identical''), meaning that they develop from one zygote, which splits and forms two embryos, or dizygotic (''fraternal''), meaning that each twin develops from a separate egg and each egg is fertilized by its own sperm cell.		A '''twin''' is one of two offspring produced in the same pregnancy. Twins can be either [[monozygotic]] ("identical"), meaning that they develop from one [[zygote]], which splits and forms two embryos, or [[dizygotic]] ("fraternal"), meaning that each twin develops from a separate egg and each egg is fertilized by its own sperm cell.

	==Types of ~~twins~~==		== Types of Twins ==
	~~Twins can be classified into two main types: monozygotic and dizygotic.~~

	===Monozygotic===		=== Monozygotic Twins ===
	[[Monozygotic]] twins, also known as identical twins, occur when a single egg ~~is fertilized to form one zygote which then divides~~ into two ~~separate~~ embryos. ~~Monozygotic~~ twins share the same genetic material, are always the same sex, ~~and look very similar~~.		Monozygotic twins, also known as identical twins, occur when a single fertilized egg splits and develops into two embryos. These twins share the same [[genetic]] material and are always of the same sex. The splitting of the zygote can occur at various stages, leading to different types of placentation, such as monochorionic or dichorionic.

	===Dizygotic===		=== Dizygotic Twins ===
	[[Dizygotic]] twins, ~~also known as~~ fraternal twins, ~~occur when~~ two separate eggs ~~are fertilized~~ by two separate sperm. ~~Dizygotic~~ twins ~~share~~ about 50% of their ~~genetic material,~~ can be the same ~~sex~~ or different sexes, and ~~generally look no more similar than siblings~~.		Dizygotic twins, or fraternal twins, result from the fertilization of two separate eggs by two separate sperm cells. These twins are genetically similar to regular siblings, sharing about 50% of their DNA. They can be of the same or different sexes and have separate placentas.

	==~~Twin studies~~==		== Causes of Twinning ==
	~~[[Twin studies]] are studies conducted on identical or fraternal~~ twins~~. They aim to reveal the importance of environmental and genetic influences for traits~~, ~~phenotypes~~, and ~~disorders~~. ~~Twin research is considered~~ a ~~key tool in behavioral genetics and in content fields~~, ~~from biology~~ to ~~psychology~~.		The occurrence of twins can be influenced by several factors, including genetics, maternal age, and fertility treatments. Women who have a family history of twins, particularly on the maternal side, are more likely to have twins themselves. Older mothers and those undergoing fertility treatments are also at a higher risk of having twins.

	==~~See~~ also==		== Complications ==
			Twins are at a higher risk for certain complications during pregnancy and birth. These include [[twin-to-twin transfusion syndrome]], preterm birth, and low birth weight. Monozygotic twins can also face complications related to shared placental structures, such as twin reversed arterial perfusion (TRAP) sequence.

			== Cultural Significance ==
			Twins have held a special place in various cultures throughout history. In some cultures, twins are considered lucky or are believed to possess special powers. In others, they may be viewed with suspicion or fear. The [[Yoruba people]] of Nigeria, for example, have one of the highest rates of twinning in the world and have a rich cultural tradition surrounding twins.

			== Notable Twins ==
			Some famous twins include the [[Bunker brothers]], Chang and Eng, who were conjoined twins from Siam (now Thailand) and became famous in the 19th century. In modern times, [[Mark and Scott Kelly]] are notable identical twins who have both served as astronauts.

			== Related Pages ==
	* [[Multiple birth]]		* [[Multiple birth]]
			* [[Conjoined twins]]
	* [[Twin study]]		* [[Twin study]]
	* [[Vanishing twin]]
	* [[Conjoined twins]]

	==References==		== References ==
	<~~references~~ />
			* "Twin Pregnancy." American Pregnancy Association.
			* "Monozygotic and Dizygotic Twins." National Institutes of Health.

			== Gallery ==
			<gallery>
			File:Mauch_Twins.jpg\|Mauch twins
			File:Red-haired_Siblings.jpg\|Red-haired siblings
			File:Fraternal_twin_brothers.jpg\|Fraternal twin brothers
			File:Mirjam_Weichselbraun_and_Melanie_Binder,_ROMY_2009.jpg\|Mirjam Weichselbraun and Melanie Binder
			File:Identical-fraternal-sperm-egg.svg\|Diagram of identical and fraternal twins
			File:Mark_and_Scott_Kelly_at_the_Johnson_Space_Center,_Houston_Texas.jpg\|Mark and Scott Kelly
			File:Placentation.svg\|Types of placentation
			File:Dichorionic_twins_with_heart_activity_at_8w5d_since_co-incubation.gif\|Dichorionic twins
			File:Monoamniotic_twins_at_15_weeks.jpg\|Monoamniotic twins
			File:The_Childrens_Museum_of_Indianapolis_-_Female_ere_ibeji_twin_figure_pair.jpg\|Yoruba twin figures
			File:Chang-eng-bunker-PD.png\|Chang and Eng Bunker
			File:Tweeling_transfusiesyndroom.jpg\|Twin-to-twin transfusion syndrome
			File:Hereford_twins.jpg\|Hereford twins
			</gallery>

	[[Category:~~Twins~~]]		[[Category:Twin studies]]
	[[Category:Human development]]		[[Category:Human development]]
	~~[[Category:Genetics]]~~
	~~{{stub}}~~

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2024-02-25T19:07:48Z

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New page

'''Twin'''

A '''twin''' is one of two offspring produced in the same pregnancy. Twins can be either monozygotic (''identical''), meaning that they develop from one zygote, which splits and forms two embryos, or dizygotic (''fraternal''), meaning that each twin develops from a separate egg and each egg is fertilized by its own sperm cell.

==Types of twins==
Twins can be classified into two main types: monozygotic and dizygotic.

===Monozygotic===
[[Monozygotic]] twins, also known as identical twins, occur when a single egg is fertilized to form one zygote which then divides into two separate embryos. Monozygotic twins share the same genetic material, are always the same sex, and look very similar.

===Dizygotic===
[[Dizygotic]] twins, also known as fraternal twins, occur when two separate eggs are fertilized by two separate sperm. Dizygotic twins share about 50% of their genetic material, can be the same sex or different sexes, and generally look no more similar than siblings.

==Twin studies==
[[Twin studies]] are studies conducted on identical or fraternal twins. They aim to reveal the importance of environmental and genetic influences for traits, phenotypes, and disorders. Twin research is considered a key tool in behavioral genetics and in content fields, from biology to psychology.

==See also==
* [[Multiple birth]]
* [[Twin study]]
* [[Vanishing twin]]
* [[Conjoined twins]]

==References==
<references />

[[Category:Twins]]
[[Category:Human development]]
[[Category:Genetics]]
{{stub}}

← Older revision		Revision as of 12:24, 18 February 2025
Line 52:		Line 52:
	[[Category:Twin studies]]		[[Category:Twin studies]]
	[[Category:Human development]]		[[Category:Human development]]
			<gallery>
			File:Mauch_Twins.jpg\|Twin
			File:Red-haired_Siblings.jpg\|Twin
			File:Fraternal_twin_brothers.jpg\|Twin
			File:Mirjam_Weichselbraun_and_Melanie_Binder,_ROMY_2009.jpg\|Twin
			File:Identical-fraternal-sperm-egg.svg\|Twin
			File:Mark_and_Scott_Kelly_at_the_Johnson_Space_Center,_Houston_Texas.jpg\|Twin
			File:Placentation.svg\|Twin
			File:Dichorionic_twins_with_heart_activity_at_8w5d_since_co-incubation.gif\|Twin
			File:Monoamniotic_twins_at_15_weeks.jpg\|Twin
			File:The_Childrens_Museum_of_Indianapolis_-_Female_ere_ibeji_twin_figure_pair.jpg\|Twin
			File:Chang-eng-bunker-PD.png\|Twin
			File:Tweeling_transfusiesyndroom.jpg\|Twin
			</gallery>