There are two different types of twins. ... Monozygotic are identical twins, and dizygotic are fraternal twins. Identical and fraternal are the two most common types of twins, but there is also other rare and unusual types of twins; polar body twins for example.
Identical twins are developed with only one egg. ... No one knows why the egg splits, or divides, in half; but when it does the twins become genetic clones of one another. ... One interesting fact that most people don’t know is identical twins have similar handprints, and foot prints, but their fingerprints are different.
Identical twins are not identical in every way. The myriad of differences between identical twins is explained only by differences in their environments or by unusual events occurring soon after fertilization. ... One of the twins could be right handed, while the other is left. ... It is very rare to see identical twins weighing the same amount at birth. Sometimes identical twins will have birthdays on different days, because one was born before midnight, and the other was born after. The variations among both types of twins sometimes challenge the ability of scientists, family members, and even twins themselves to know for sure if they are identical or fraternal. ... Another theory states that since the rate of identical twins is higher in older or very young women, it may be due to a hormonal imbalance seen at this age. Supporting this, mothers of identical twins have been shown to have an earlier menopause, which is also due to hormones.
Scientist grouped the five highest personality traits that differ in identical twins. ...
Fraternal twins come from two eggs and two sperm. ... Assortative mating would not affect identical twin resemblance, because identical twins share one hundred percent of their genes, a situation unaffected by their parents mating patterns.
Some parents are more likely to have fraternal twins in the beginning.
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