Identical and Non-identical Twins

Paper Summary:

The paper discusses the two most common types of twins; identical and non-identical twins, also known as monozygotic and dizygotic twins. The paper looks at the differences between identical and non-identical twins. The paper then talks about a third type of twins; half-identical or polar body twins.

Outline:
What Are Twins
Types of Twins
Identical Twins
Comparing Non-Identical Twins with Identical Twins
A Third Type of Twinning

From the Paper:

"In a normal pregnancy, a single baby develops in the uterus of the mother. In very special circumstances, two and sometimes even more babies develop simultaneously in the mother's uterus. This is called a multiple pregnancy. Twins are two babies in a multiple pregnancy. Twins are considered very special and present a fascination for science and society. In the fields of psychology and sociology, there is a special subfield called "twin studies". Twins studies are especially important in the search for answers to the nature vs. nurture question. What is the most important factor in human development: genetics (nature) or environment (nurture)?"

Sample of Sources Used:

• Facts About Multiples: An Online Encyclopedia of Multiple Birth Records. How Multiples are Formed. http://www3.telus.net/tyee/multiples/index.html
• Proactive Genetics (2007). FAQ - Twin and Triplet Zygosity. http://www.proactivegenetics.com/faqzygosity.dna#1

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