Originally posted by: broshiggie
Ok reareading your first post i think i know what the issue is, you are thinking that it is a sex linked trait (which would explain using x's and y's).

If that is the case, then yes, you have been correct this whole time, but you NEVER mentioned once that you believed it was sex linked.

My punnet square does not use sex linked traits, so it is not wrong (no x's and y's) going by purely dominant/recessive interactions. And assuming that the allele for the sharingan is a recessive allele on the x chromosome, there still would be no chance of any f1 offspring having the trait.

Basic Biology

Dominant - This is an allele that is always expressed if present. Example: Smooth peas are dominant over wrinkled peas. If either of the two genes in a pea plant that codes for pea shape is smooth, then the peas produced by the plant will be smooth.

Genotype - This is the genetic code of the organism. Dominant and recessive alleles that code for the same trait are given the same letter. The dominant allele is always capatilized. Example: S = smooth peas, s = wrinkled peas. Using the same example, a pea plant can have one of three genotypes for pea shape. SS, Ss, ss
In genetics the term DOMINANT usually refers to alleles, not to which phenotype is expressed. You even said it quoted it in your definition, it is a dominant allele or trait. Yes, if we have two reccessive alleles, the recessive trait will SHOW DOMINANCE and it will be of the recessive phenotype. But i am sure that you understand that does not change the fact that the recessive alleles are still recessive alleles (and not suddenly mutate and become dominant alleles). Dominant and recessive genes are talked about in terms of genotype, as can be seen on the website i provided.

HOPEFULLY THIS CLEARS UP MATTERS SO PPL WONT BE FAILING TEH SUPAR HARD AP BIO EXAMS THSI WEEK!!!11

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In my first post I stated that the Sharingan allele is recessive. I was merely pointing out that it was dominant in Sasuke. I also stated that it was a sex linked trait, thus the Y's.

NEWAYs, I'm just glad that broshiggie understands. [img]i/expressions/face-icon-small-tongue.gif[/img] Like I stated earlier, I remembered this from the scarring (AP and Microbiology) a couple of years ago. [img]i/expressions/face-icon-small-tongue.gif[/img] Yeah, you're right it's called punnet square.

Pointer for originalkrm, phenotype corresponds to its dominant genotype. That's why I said that they go hand in hand, but you didn't understand that.

I know that the genotype determins dominance. I was trying to get you to understand that. Yes, the sharingan allele is recessive, but in Sasuke it is dominant, because his sharingan genotype (alleles) are dominant. Thus the phenotype shows, which is sharingan, the red eyes with comma like pupils. Whichever genotype is dominant the corresponding phenotype shows. I didn't look up any of this crap. I just remembered it.