What are Genetics?

http://www.school.eb.com/eb/article?tocId=9110582

I learned form this article that..

• Heredity remained a secert until the 19th century, when the studies of Genetics developed
• Heredity-The passing on of physical or mental characteristics genetically from one generation to another.
• I found it interesting that the study of peoples genes did not make anyone curious and how the research on it started so late.
• Genetics determine who you are
• Your DNA makes you who you are
• Genes are made up Deoxyribo Nucleic Acid
• Deoxyribo Nucleic Acid-
• 1.a self-replicating material present in nearly all living organisms as the main constituent of chromosomes.
• 2. The fundamental and distinctive characteristics of someone or somthing, esp. when regarded as unchangeable.

This article made me think 

• Is it possible to change your DNA?
• Is there such thing as a DNA transfusion?
• Is it possible to be born with half of a chromosome?