A sibling is one of two or more individuals having one or both parents in common. A femaleШУУД ҮЗЭХ and
A sibling is one of two or more individuals having one or both parents in common. A female sibling is a sister and a male sibling is a brother. In most societies throughout the world, siblings often grow up together, thereby facilitating the development of strong emotional bonds. The emotional bond between siblings is often complicated and is influenced by factors such as parental treatment, birth order, personality, and personal experiences outside the family. However, there are cases where siblings grow up in separate homes, in different environments. It is known that both nature and nurture figure in development; researchers are attempting to ascertain just which one plays the larger role. Identical twins share 100% of their DNA. Full siblings are first-degree relatives and, on average, share 50% of their genes out of those that vary among humans. Half-siblings are second-degree relatives and have, on average, a 25% overlap in their human genetic variation. There are two type of twins, identical and fraternal. Identical twins have exactly the same genes; fraternal twins are no more similar than regular siblings. Often, twins with a close relationship will develop a twin language from infanthood, a language only shared and understood between the two. Studies suggest that identical twins appear to display more twin talk than fraternal twins. At about 3 years of age, twin talk usually ends. Knowing from past studies that genetics played a larger role in one's personality during the earlier years, researchers were interested in older subjects, as to whether their theory still held. They gathered subjects with a mean age of 59, including 99 pairs of identical twins and 229 pairs of fraternal twins who were all reared separately; and 160 pairs of identical twins and 229 pairs of fraternal twins who were all reared separately. They studied the most inheritable personality traits: emotionality, activity level, and sociability (also known as EAS). The study found that identical twins resembled each other twice as much as fraternal twins, due to genetic factors. Furthermore, environment influences personality substantially, but it has little to do with whether twins are raised together or apart. It also suggests that inheritability is substantial but has less significance later on in life.
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