--BEGIN QUOTE--

"Yes.  Fujinami-san's has a blood type of B positive,
while his daughter was confirmed to have type A
negative.  If Ryuunosuke was his son, she should be
AB positive, assuming the mother was either O or A
positive," the representative explained.  "Under the
circumstances, should we continue the testing?"

--END QUOTE--

I need to comment on this passage. People carry 2
genes (one from mom and one from dad) for the ABO
blood groups as well as the Rh Factor. The O and Rh-
genes are RECESSIVE which means they cannot be
detected without genetic testing (regular blood
grouping doesn't cut it) if the person also carries a
DOMINANT gene (A or B, Rh+). Note that ABO and Rh are
independent of each other. So this means:

Person that is A or O (Mom): for A+... Can either
have an O and A gene (AO) or two A genes (AA), and
since the Rh+ gene is DOMINANT, the person has 2 Rh+
genes (--) or one of each (+-). For O+... Must have
to O genes (OO) and has 2 Rh+ genes (--) or one of
each (+-).

Person that is B+ (Dad): Can either have an O and B
gene (BO) or two B genes (BB), and since the Rh+ gene
is DOMINANT, the person has 2 Rh+ genes (++) or 1+
and 1- (+-).

Possible outcomes for offspring (she can only inherit
one of the pair of genes from each parent): O- or O+,
B- or B+, A- or A+, AB- or AB+ (A and B a codominant,
so they express equally when both are present). The
situation you set up makes all ABO and Rh combos
possible (if you are going by blood groups alone...
no genetic analysis).

Here is my suggestion: make the Mother O+ or O- and
keep  Fujinami-san B+. And if you make Ryunosuke AB+
or AB-, that means she must have gotten the A gene
from somebody other than  Fujinami-san.

===
Ronald Chan (ICQ# 21252450)
Artistic Inks: All Things Manga...
http://www.geocities.com/~pocket_knight/





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