To understand where Muggleborns come from, we should understand
the concept of human genetics:
- Each person has 2 genes in each cell (which are identical from
cell to cell) for each characteristic. One from the mother. One
from the father. They can be different or the same.
- Each egg or sperm has either a copy of one of the genes or of
the other. Never both.
- When a man and a woman reproduce an egg and sperm combine and
the genes from the egg and sperm for a particlar characteristic
decide the characteristic.
- To decide, some genes are dominant, and some are recessive
A dominant gene will overrule a recessive gene in choosing characteristics.
- For example, say we have a mother and father. Each has a gene
for brown eyes, and one for blue eyes. Brown is the dominant gene,
- If a sperm with a gene for brown eyes meets an egg with a gene
brown eyes, then the child will have brown eyes, and all his children
will almost definitely have brown eyes too, as they will always
have brown in their genetic makeup.
- If a sperm for brown meets an egg for blue (or vice versa) the
child will have brown eyes, as the brown overrules the blue. However
the child may have children with eyes which are either brown or
blue (or perhaps even another colour)
- The only time when the childs eyes will be blue is when blue
meets blue. Even then, his children could have different colour
eyes if his/her partner has a gene which is more dominant.
We can use this theory to explain the concepts of muggleborns
- The factor which decides whether or not a person is a Wizard
may well be in the genes.
- Non-wizard would be the dominant gene and Wizard the recessive
- This means Wizard gene must meet Wizard gene for the child to
be a Wizard.
- To put this into the context of the characters:
- Lily and Petunia are sisters, but one is a witch and the other
- Therefore either each of their parents must have a Wizard gene
and a Non-Wizard gene. They have Wizard in them.
- In Lily's case, the two Wizard genes met to give her Wizard
powers. She is pure witch.
- In Petunia's, either two Non-Wizard genes met, making her pure
muggle, or a Wizard and Non-Wizard met, meaning she is Muggle
but has Wizard in her.
Therefore there may well have been some magical ancestor in the
Evans line. Or perhaps they were just carriers of the Wizard gene
and Lily was the first time it came out. It's probably the former,
but who knows.
The only point against this theory is the concept of squibs, as
if my genetics are true then no Wizard should have a Non-Wizard
gene which genetically should be present for a Wizard to have a
muggle child. My theory then is not perfect but the best I can come
up with and I haven't seen better. I can only point out that if
the genetics theory is right then Wizard must be the recessive (As
there are so much more muggles then Wizards. You can fit all the
Wizard children in Britain into one highschool) (Sod_off_Balrick)