Originally posted by: hiten mitsurugi
Originally posted by: Mut@t@
let's say:

X = no sharingan (dominant)
x = sharingan (recessive)

sasuke = xx
random non-uchiha female = XX

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a child born with sharingan must have xx and can't be xX or Xx since capital X is dominant.

if sasuke (xx) and random non-uchiha (XX) were to have a child, the posibilities are: xX, Xx, xX, and Xx. therefore, sasuke can't have a child born with sharingan with a random non-uchiha female.

sasuke MUST be recessive since he said that only a few select members are born with sharingan. most people have at least one of the dominant (X) genes in their blood, and only a few have both recessive genes (xx). that's why only a small number of them have sharingan.

and even if sasuke were to have a baby with sharingan, the kid would have to be a full uchiha to be able to use mangekyou sharingan. which is why the sharingan is so deadly.

i don't know, i might be missing something.
Let me explain agan Dazzz

The gene is considered recessive if it is present in the person but isn't expressed. The gene is dominant when it is expressed.

Yes the gene is recessive for the majority of the Uchihas, because even though they carry the sharingan gene, they don't have it.

Sasuke's sharingan gene is dominant. Why? Because he has the sharingan.

So to clear up your confusion:
Dominant doesn't mean for the majority of a population. It just means that it is expressed for that certain individual.

Recessive doesn't mean for the majority of the population as you suggested; it just means that the gene isn't expressed for that particular individual.

It's on an individual basis.

Therefore having the sharingan would mean that the sharingan trait is dominant.
Not having the sharingan trait would mean that the sharingan trait is recessive.
Actually you're confusing phenotype and genotype. phenotype is what's expressed externally, and genotype is the genetic makeup. A trait is dominant if in when it's allele is expressed perferentally like brown eyes vs blue eyes, and recessive if it's not. For instance brown is a dominant gene because if you've got an allele for brown eyes, and one for blue eyes, your eyes are brown.

As for Sasuke and the sharingan. none of his children will have the sharingan if the sharingan is recessive. however his grandchildren will if his children inbred. (nasty, but that's the only way to get the sharingan in 2 generations)

however, there are also cases of incomplete dominance as in the case of the snap dragon flower. there's a red allele and a white allele. if the two of them are mixed together, then you get a pink snap dragon flower instead of either a red or a whilte. this is also possible in the case of the sharingan. Itachi and Sasuke are the most powerful of the uchiha clan because they have 2 copies of teh sharingan gene instead of one, and people with one copy are less powerful.