Twin studies are studies that assess identical (monozygotic) twins for medical, genetic, or psychological characteristics to try to isolate genetic influence from environmental influence.
Twins that have been separated early in life and raised in separate households are especially sought-after for these studies, which have been invaluable in the exploration of human nature.
Among fraternal twins, in rare cases, the eggs are fertilised at different times with two or more acts of sexual intercourse, either within one menstrual cycle (superfecundation) or, even more rarely, later on in the pregnancy (superfetation).
Twins in animal biology is a case of multiple birth in which the mother gives birth to two offspring from the same pregnancy.
Twin studies are studies that assess identical (monozygotic) twins for medical, genetic, or psychological characteristics to try to isolate genetic influence from environmental influence.
Twins that have been separated early in life and raised in separate households are especially sought-after for these studies, which have been invaluable in the exploration of human nature.
Fraternal twins (commonly known as "non-identical twins") occur when two fertilized eggs are implanted in the uterinewall at about the same time, within the same menstrual cycle, or inrare cases within one menstrual cycle of each other.
Dizygotic twins are no more similar genetically than any siblings and develop in separate amnions, with separate placentae.
Twin - Biocrawler(Site not responding. Last check: 2007-11-03)
Fraternal twins (commonly known as "non-identical twins") occur when two fertilized eggs are implanted in the uterine wall at about the same time, within the same menstrual cycle, or in rare cases within one menstrual cycle of each other.
Twin studies refers to the practice of assessing identical twins for medical, genetic, or psychological studies to try to find innate similarities and differences and isolate genetic influence from environmental influence.
Twins that have been separated early in life and raised in separate households are the most sought-after for these studies, which have been invaluable in the exploration of human nature.
Many identical twins spend most of their time together (especially as children), so people can assume that they will behave alike just as they look alike; however, this is not the case.
There are some patterns of twinning that are exceedingly rare: while they have been reported to happen, they are sufficiently unusual that most obstetricians or midwives may go their entire careers without encountering a single case.
When the MinnesotaTwins were winning pennants 15-20 years ago, they were said to have a "Dome Field advantage," playing in their comfy bubble of the Metrodome and in front of their inspirational, hankie-waving fans.
Dizygotic twins, like any siblings, have a very small chance of having the exact same chromosome profile, but most likely have a number of different chromosomes that distinguish them.
Dizygotic twins may be a different sex or the same sex, just as with any other siblings.
A chimera may arise either from identical twin fetuses (where it would be impossible to detect), or from dyzygotic fetuses, which could be identified by chromosonal comparisons from various parts of the body.
www.livoc.com /thank-you/twins.php (1929 words)
Twin (disambiguation) -(Site not responding. Last check: 2007-11-03)
Twins are often a central theme in mythology.
Twincities: two towns or cities that are geographically close to each other, and often referred to collectively.
Twins is a sitcom that debuted on The WB network in September 2005.
The Loop is at the centre of Chicago's business district, and is so named after the ‘loop’ defined by the elevated rail track.
In the background are the massive twin towers of the World Trade Center, which collapsed after terrorist attacks on 11 September 2001.
In Manhattan, New York, are the Empire State Building 1931 (102,381 m/1,250 ft high) storeys and, until their destruction by terrorist attack in 2001, the twin towers of the World Trade Center 1970–74 (415 m/1,361 ft), but these are surpassed by the Sears Tower in Chicago 1973 (443 m/1,454 ft).
encyclopedia.farlex.com /skyscraper (877 words)
Belly Twins(Site not responding. Last check: 2007-11-03)
Since some premature births often have health consequence to the babies, twins birthare often handled with special procedures than regular births.
Fraternal twins (commonly known as "non-identical twins") occur when two fertilized eggs are implanted in the uterinewall at about the same time, within the same menstrual cycle, or inrare cases within one menstrual cycle of each other.
Identical twins occur when a single egg is fertilized to form one zygote (monozy...
Twins in human biology are two individuals who have shared the uterus during a single pregnancy and are usually, but not necessarily, born in close succession.
Dizygotic twins may be a different sex or the same sex.
Identical twins do not run in families, but occur more or less randomly.
Apollo(Site not responding. Last check: 2007-11-03)
Alternate uses: Apollo program, for others see Apollo (disambiguation)Apollo ("destroy" or "excite"), is a god in Greek and Roman mythology, the son of Zeus and Leto, and the twin of Artemis (goddess of the hunt).
Apollo ("destroy" or "excite"), is a god in Greek and Roman mythology, the son of Zeus and Leto, and the twin of Artemis (goddess of the hunt).
In later times he became equated with Helios, god of the sun, and by proxy his sister was equated with Selene, goddess of the moon.
www.explainthat.info /ap/apollo.html (2587 words)
[No title](Site not responding. Last check: 2007-11-03)
Since some premature births "Twin" may also be used to refer to a pair Twin Towers,, two shoes, or two scientific studies.
The Twin Towers was also the widely-used nickname given - prior to the - to the basketball players Tim Duncan and David Robinson of the The nickname had previously been used when the 7'0"/2.13 m and the 7'4"/2.24 m Ralph Sampson played together for the in the mid- 1980s.
The Twin Towers was also the name of a wrestling tag team in the World Wrestling Federation in the late 1980s.
www.en-cyclopedia.com /index1/tw (1983 words)
Ski - The real meaning from Timesharetalk wikipedia(Site not responding. Last check: 2007-11-03)
In the past five years twin tips have become popular among youth skiers, ages 14-21.
The Line ski company has manufactured ski boards since the mid 1990s and is credited with the creation of the first modern, twin tip ski board.
Skiboards, when skiing on extreme high speed and on the flat bottom of the skiboard, tend to vibrate, and thus some people prefer to ski on the edge of the ski in order to decrease the vibration and have more control of the ski.
