Heredity is the passing of traits from parents to offspring. Heredity is what makes you, you. Your grandparents passed their traits to your parents and your parents passed their traits to you. That's why you look like them so much, you get some traits from your mom and some from your dad. 
Gregor Mendel was an Austrian monk. He was referred to the "Father of Genetics" because he performed one of the first genetics experiments. He would use pea plants for his experiments because they were easy to use. He found out that the color, shape, and size of the pea plant didn't blend, it was one or the other, one being more common. Today we know that is not always the case.
An allele is an alternate form of a trait. (WW, Ww, ww)
A dominant trait is a trait that is strong and that covers the weaker traits, and they also can be seen.
A recessive trait is the weaker trait and it is covered by the stronger trait. Recessive traits can only be seen if there are two versions.
Incomplete dominance is when one allele doesn't completely dominate over the other and it creates a different phenotype. Just like a pink
snapdragon flower is the result of
a red and white snapdragon.
Homozygous alleles are when you have two versions of the same trait. (WW) Heterozyous alleles are when you have two different versions of a trait. (Ww) 
Reginald Punnett was one the first geneticists and he created the punnett square. The punnett square is a mathematical square that helps find the possibility of genetic combinations.
A pedigree is a diagram that shows the inheritance of a trait or a disease through many generations. It shows if a person is healthy, affected, or a carrier.
Hemophilia is when your blood doesn't clot. It is common to have internal and external bleeding, bruising, swollen joints, etc.
My patient got Hemophilia because both of her parents were carriers. That meant there was a 25% chance she was going to get the disease, and she did. If my patient had a child with a man who was a carrier of this disease, these are the possibilities:
Healthy- 25% chance
Carrier - 25% chance
Affected- 50% chance
