Don’t read it if you don’t like vampires who can have children. (I particularly don’t like this idea.)
The genetics of vampires have been discussed many times in our various communities. And today we have a lot of possibilities of the genetic theory for vampirism.
There are many vampires who believe to come from the Nephilim, Aliens, or various god-like figures such as Caine, Lilith, Set or Osiris. All of these have one common theme: A line of descent from one or more progenitors to present day vampires. A line of descent implies a genetic reason for vampirism. This doesn’t rule out other reasons such as environmental or spiritual, but does indicate at least one part of vampirism is genetic.
If vampirism is genetic it has to be recessive. By this we can suppose that it is carried from generation to generation through a recessive gene as opposed to a dominant one.
A little bit of biology:
All genes come in pairs. These can be dominant/dominant, dominant/recessive, or recessive/recessive. Dominant genes always overpower the recessive ones. As such, a dominant feature (due to a dominant gene) is much more common to have as opposed to a recessive one. For more information on this, consult an upper level high school book on biology.
More specifically to humans and vampires:
If we make H = Dominant Human Gene
and we make v = Recessive Vampire Gene
How would a vampire be created through genetics? Let us explore the possibilities:
A man and a woman have children. The man and the woman have the possibility of the following gene combinations:
HH = Totally Human
Hv = Human but a carrier of the recessive vampire gene
vv = Totally Vampire
Let us now take 5 different couples:
Couple 1 is HH and HH (both parents are human)
Couple 2 is HH and Hv (one parent is human the other is a carrier of vampire dna)
Couple 3 is HH and vv (one parent is human the other is a vampire)
Couple 4 is Hv and vv (one parent is a carrier of vampire dna the other is a vampire)
Couple 5 is vv and vv (both parents are vampires)
(There are some areas of genetics that are only passed by one sex or the other. For now, let us just go with the idea that vampirism can be carried and instanciated by both men and women. As such the sex of the above couples is irrelevant.)
Now, let us see the offspring of each couple:
Couple 1 (HH and HH) would have the following offspring:
1stH + 1stH = Totally human
1stH + 2ndH = Totally human
2ndH + 1stH = Totally human
2ndH + 2ndH = Totally human
Here we see that totally human parents have a 100% chance of producing a totally human offspring.
Couple 2 (HH and Hv) would have the following offspring:
1stH + H = Totally human
1stH + v = Human who is a Carrier of Vampire dna
2ndH + H = Totally human
2ndH + v = Human who is a Carrier of Vampire dna
Here we see that this couple would have a 50% chance of producing totally human offspring and 50% chance of producing a human who is a carrier for vampire dna.
Couple 3 (HH and vv) would have the following offspring:
1stH + 1stv = Human who is a Carrier of Vampire dna
1stH + 2ndv = Human who is a Carrier of Vampire dna
2ndH + 1stv = Human who is a Carrier of Vampire dna
2ndH + 2ndv = Human who is a Carrier of Vampire dna
This couple has a 100% chance of producing a Human who is a carrier of vampire dna.
Couple 4 (Hv and vv) would have the following offspring:
H + 1stv = Human who is a Carrier of Vampire dna
H + 2ndv = Human who is a Carrier of Vampire dna
v + 1stv = Vampire
v + 2ndv = Vampire
This couple has a 50% chance of producing a carrier for vampire dna and a 50% chance for producing a real vampire.
Couple 5 (vv and vv) would have the following offspring:
1stv + 1stv = Vampire
1stv + 2ndv = Vampire
2ndv + 1stv = Vampire
2ndv + 2ndv = Vampire
This couple has a 100% chance of producing a vampire.
In summary we have the following potentials:
Couple 1: 100% Human
Couple 2: 50% Human, 50% Carrier
Couple 3: 100% Carrier
Couple 4: 50% Vampire, 50% Carrier
Couple 5: 100% Vampire
I would now like to address the three main types of vampires we seem to encounter:
Vampires who know what they are virtually from birth
Vampires who awaken themselves later on in life (usually around puberty)
Vampires who must be awakened (often said to be turned) by others
There’s a suggestion that those who are products of Couple 5 are much more likely to know what they are from birth.
Those who are products of Couple 4 are more likely to self-Awaken later on in life.
Those who are carriers, which can be from Couple 2, 3 or 4 are the ones that many call Latent Vampires, or those who are ‘turned’ by other vampires already Awakened.
Based on this creed, we can find a lot of histories. Most of them are about ‘half-vampires’ or children from humans and vampires.
This theory that vampire can have children brought also another theory that the vampire incidence on the medieval age was stonger around Europe, because of the commom practice of consanguineous marriage. At this time was very common to marry anyone from your own fammily, specialy in the real families (Blood Countess case, maybe…) and consequentily more people with the recessive gene were born, brigging more and more vampires to life.
This consanguineous marriage was also very common around Romanian and in the Transylvanian territory, It mays also mean that Vlad III, the Impaler (OH GOD…!) can be a natual-born vampire too.
Many people really believe in the Vampiric DNA theory, and they also have two different ways of thinking. For exemple, there are some people who say that, based on the Vampiric DNA theory, now a days we all needed to have the vampire recessive genome. That means, a minimun of 90% of the actual population were needed to be Carriers of the Vampire Genome, or to be ‘half-vampires’, during the many years of reproduction.
There is also another theory, which says the vampire genome was extinct with the plague in the dark ages. And that this genome is able to come back, with mutations and another genome things… You may believe in whatever you want.
Source: Bloodlines.com (now, not working anymore….)