four featureof identical twins
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Characteristics of Twins
By C.K. Adams; Updated August 06, 2018
You can't tell if twins are fraternal or identical just by appearance. Jupiterimages/Goodshoot/Getty Images
When one pregnancy produces two babies, the result is twins. While born at the same time, twins inherit different traits and may not even look similar. Twins characteristics may be different in personalities and mannerisms. The two most common types of twins are monozygotic and dizygotic. Monozygotic stands for identical twins who formed from one zygote, while dizygotic is fraternal twins who formed from two zygotes.
Sororal or Fraternal Twins Facts
Even if born at the same time, twins may not be identical or share the same gender in a fraternal or sororal pairing, Sororal is for female fraternal twins. In the case of fraternal twins, two eggs cells are independently fertilized with two different sperm cells. Fraternal twins share about 50 percent of their genes, the same percentage as other siblings. Fraternal twins may even look alike but still did not share the same egg, therefore they are not classified as identical. Boy girl twins occur in fraternal twins. Fraternal twin personality traits differ in the same way as other non-twin siblings, especially when the twins are treated as individuals rather than as a twin set.
Identical Twins Facts
When one egg is fertilized but at the two cell stage divides into two embryos, the result is a set of identical twins. These twins possess identical genes, and they are always the same sex. Even though identical twins share the same DNA, environmental factors and non-shared experiences cause differences in personality over time. For example, when twins are adopted by different parents, they grow up differently and change slightly from one another. However, many identical twins also continue to be alike in IQ and personality throughout their lives.